TULKARM, West Bank

She knew that once she put on the explosive belt, there would be no turning back. She knew it would rip her limb from limb, reducing her to a bloody pulp. She knew it would leave her only daughter an orphan.

But she also knew this: It would kill Israelis. With luck, a lot of them. And that was reason enough to do it.

Shifa al-Qudsi was a suicide bomber, or at least tried to be. A Palestinian hairdresser driven to anger, despair and hopelessness, she volunteered to carry out an attack on Israelis that would strike a blow, she thought, for her beleaguered people. “I wanted to seek revenge,” she said.

But she was arrested before she could act and today, after six years in an Israeli prison, Ms. Qudsi has transformed herself from a would-be deliverer of death into a messenger of peace. Now working with a group that brings Palestinians and Israelis together to advocate an end to the conflict between their peoples, she tries to channel the rage that took her to the brink into a nonviolent movement for change.

Ms. Qudsi offers a window into the world of terrorism amid a fresh wave of attacks by Palestinians. Mainly wielding knives rather than bombs, this new generation of attackers are nonetheless also committing suicide for their cause, since they know they are likely to be shot by Israeli soldiers.

Ms. Qudsi understands the kind of thinking that makes sacrificing oneself seem like a rational response to deep feelings of grievance.

“They occupy your home, your land, they kill your relatives and your people — of course you’re upset,” she said. “You have no other option but to seek revenge.”

Now 40, she smoked as she reflected on her life in this corner of the West Bank occupied by Israeli forces for nearly 50 years. Looking back, she still embraces the resentment if not the methodology.

“I don’t feel bad that I made that decision,” she said of her brush with death. “But now I reject suicide attacks. God decides when we will live and when we will die. Now my jihad is to send out a message to the world. The world must know the Palestinians’ land is occupied. We are people who want peace, just peace.”

She has come to know Israelis who share her views as part of Combatants for Peace, an organization of former Israeli soldiers and Palestinian fighters reaching across lines that separate them. “I want to stop the bloodshed,” Ms. Qudsi said.

The group is featured in a new documentary, “Disturbing the Peace.” But old suspicions die hard, and Ms. Qudsi was not permitted by the Israeli authorities to attend the Jerusalem premiere in July, nor allowed to travel to the United States Consulate in Jerusalem to obtain a visa to attend a showing early this month at the Hamptons International Film Festival on Long Island. The movie will debut in New York City on Nov. 11, and she still hopes to attend.

AN ISRAELI official said that Ms. Qudsi’s application was not filed by a deadline and that future ones would be considered. But the potential security risk would be a factor, said the official, who declined to be identified discussing an individual case.

If viewed warily by the Israeli authorities, Ms. Qudsi is not accepted by everyone at home either. Palestinian attackers are celebrated in the West Bank as martyrs, and their families receive compensation from the Palestinian Authority. Cooperation with Israelis, even like-minded ones, is often deemed betrayal.

“The Palestinian people have lost hope and don’t believe that peace with the Israelis will ever be achieved,” said Mahmoud Mubarak, president of the Jalazoun refugee camp council. “Many Palestinians consider the participation in joint projects with Israelis as normalization.”

Normalization refers to making the current situation better rather than seeking to overturn it altogether. Omar Barghouti, a founder of the boycott, divestment and sanctions movement, called B.D.S., which targets Israel internationally, said the ostensible neutrality of groups like Combatants for Peace actually cemented the occupation.

“Joining normalization groups like Combatants for Peace is certainly not the answer; it aggravates the problem,” he added. “Normalizing Israeli apartheid only entrenches it.”

In an interview in a cafe one morning this fall, Ms. Qudsi denied enabling the occupation. “I’m against normalization. We are all against normalization, even this group,” she said. “There’s a huge difference.”

Ms. Qudsi was one of 10 children in her family who grew up in Tulkarm, in the northern section of the West Bank. Her father, who managed a coffee shop, ran a conservative household, and when she was 15, she was married to a cousin. They had a daughter but divorced when Ms. Qudsi was 17.

She worked in a hair salon and had little interest in politics. “I wasn’t really paying attention to what was going on around me,” she said. “I would only open the newspaper to look at the horoscope.”

But after the second intifada, or uprising, began in 2000, the conflict found her. Two cousins were shot. The sound of explosions gave her daughter nightmares. The mother of her daughter’s friend was killed. Her brother, Mahmoud Adnan al-Qudsi, tried to mount a suicide attack, only to be arrested.

Finally, at age 25, Ms. Qudsi said she could take it no more. She approached militants and offered to conduct an attack. She would pretend to be pregnant, wearing a suicide belt underneath a maternity dress. Another bomber paired with her would set off his explosives after she detonated hers.

Ms. Qudsi insisted on targeting soldiers, not civilians. But she acknowledged no qualms about killing other people, no sense that she would continue the cycle of violence without resolving anything. Her main misgiving was leaving her 6-year-old daughter, Diana.

“I told my daughter I’m going to go out and carry out a suicide attack so you can survive,” she recalled. “It was very, very difficult for a mother to tell her only daughter, ‘I’m going to die.’ But because my daughter had seen her friend’s mother die, she asked me one question: ‘Will we then live in peace? Will we live in freedom? Will this end?’ ”

Diana pleaded with her mother. “She said, ‘Mama, please don’t leave me. I only have you,’ ” Ms. Qudsi said. “But the desire I had took over — to take revenge for everything that was happening around me.”

The night before her attack in April 2002, though, Israeli security forces, tipped to the plan, burst into her house. According to the Israeli authorities, Ms. Qudsi was interrogated for three days before being charged and convicted of conspiracy to commit premeditated killing and possession of explosives. She said she was beaten in prison.

WHILE locked up, Ms. Qudsi rethought her course. Although still angry at Israelis, she began reading the writings of Mahatma Gandhi and Nelson Mandela. She met a female Israeli prison guard who treated her with respect.

“That’s what made me feel that not every Israeli is the same,” she said. “There’s a difference between Israelis who want to carry a gun and shoot us.”

Released in 2008, she joined Combatants for Peace. Among those she met was Chen Alon, an Israeli military officer who spent time in jail after refusing to serve in the occupied territories.

Mr. Alon was shocked by her story. “I could identify with everything except the decision — the terror, the hopelessness, the idea that this was the only thing that could provide a future for her daughter,” said Mr. Alon, now a theater director and lecturer at Tel Aviv University. “I don’t accept it, but I can understand it.”

“I told her that a suicide attack is a crazy attack,” he continued. “And she told me right in front of the group, ‘You’re saying that because you have tanks and helicopters. You think this because you can bomb us from the air. But when you don’t have anything in hand to protect yourself, these belts are the only weapon we have.’”

“That,” he added, “made me think, ‘Wow, I didn’t think about it this way.’ ”

For Ms. Qudsi, that is the challenge. To make others think like a suicide bomber. And to make herself not think like one. “I was only looking at the situation from one side,” she said. “Now, I’m looking at it from both.”