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RENO, Nev. — On Wednesday afternoon, just as she sat down to watch TV and eat a corn dog, Ivy Ziedrich’s phone rang. It was her sister in Montana.

“I am so proud of you,” her sister said, “for yelling at a politician.”

It was the first inkling that Ms. Ziedrich, a 19-year-old college student with a passion for the debate team and the finer points of Middle Eastern policy, had gone viral.

Her confrontation with Jeb Bush, in which she told the former Florida governor a few hours earlier, “Your brother created ISIS,” was suddenly everywhere online, casting an unwelcome hue on President George W. Bush’s legacy from the war in Iraq.

“My sister started freaking out,” Ms. Ziedrich recalled.

In an interview, Ms. Ziedrich described a dizzying 24 hours of social media frenzy, her upbringing in a conservative Republican family, and the circumstances that prompted her to approach Jeb Bush, who was in Reno for a town hall-style meeting on Wednesday.

She had shown up with a few college friends uncertain of whether she wanted to ask anything at all. But as Mr. Bush spoke about the rise of the Islamic State, and put blame on President Obama for removing troops from Iraq, Ms. Ziedrich found herself becoming furious. ISIS, she believed, was the product of George W. Bush’s bungled war in Iraq.

“A Bush was trying to blame ISIS on Obama’s foreign policy — it was hilarious,” said Ms. Ziedrich, who attends the University of Nevada. “It was like somebody crashing their car and blaming the passenger.”

She acknowledged she was deeply nervous about walking up to him after the meeting and asking her question. “I get nervous any time I talk to an authority figure — he wants to be president of the United States,” she said.

Her question and his reply seemed to distill deep, lingering anger of the war in Iraq and encapsulate Mr. Bush’s political challenges as the brother of George W. Bush. Much online commentary has focused on her somewhat aggressive tone, a fact that Ms. Ziedrich finds a bit baffling.

“I wasn’t trying to be disrespectful,” she said. In fact, she said she is grateful that Mr. Bush responded, even if it did not exactly satisfy her.

Ms. Ziedrich, a high school debater who specialized in the parliamentary style and still helps coach her former team, said that all the attention she is garnering from those on the right (who thought she was rude) and those on the left (who want to canonize her) is confounding given her own political journey. Growing up in Northern California, she considered herself a conservative like her mother and father, who is a loyal Fox News viewer.

Then she identified as a libertarian and, ultimately, as Democratic, influenced by her time spent debating and by books like Howard Zinn’s “A People’s History of the United States.”

Speaking from her apartment, Ms. Ziedrich says she is busy juggling calls from old friends and media outlets.

“I am still trying to process all of this,” she said.

So far, her mother has expressed approval of the confrontation. But she hasn’t yet spoken with her father. “I am hoping he will be proud of me,” she said.

College Student to Jeb Bush: ‘Your Brother Created ISIS’ “Your brother created ISIS,” a young college student tells Jeb Bush — creating the kind of confrontational moment that presidential candidates dread.