A 14-year-old Wisconsin girl tried to kill her brother's girlfriend, slitting her throat and telling her during the attack that she was a psychopath looking for her first kill, according to investigators.

Kali Jade Bookey of New Richmond, a city of 8,400 people about 35 miles east of Minneapolis, was charged as an adult Thursday with attempted first-degree intentional homicide. She was being held without bail Friday in juvenile custody pending a preliminary hearing Aug. 8. Her attorney, Barbara Miller, didn't immediately respond to an email or a voicemail seeking comment.

According to a criminal complaint, which the Eau Claire Leader-Telegram first reported about, Bookey called the St. Croix County Sheriff's Department on Wednesday morning to report that two men in a green pickup truck had tried to abduct her while she was riding her bike.

She told the men that her brother's girlfriend was home alone and they should take her instead. Deputies responded to the girlfriend's trailer and found her in a bedroom bleeding profusely. The 15-year-old girl was taken by ambulance to a hospital.

There, she told investigators that Bookey had attacked her. She said she was sleeping in her bedroom when Bookey, dressed in black, appeared in her room and put her hands over her mouth. A struggle ensued and Bookey punched her in the face multiple times and broke two bowls over her head. Bookey used one of the bowl shards to cut her and slit her throat, she said.

The victim said Bookey asked her if she wanted to die or bleed out, so she opted to bleed out, the complaint states. Bookey told the victim she had been biking by her house and noting the times when she was alone, and she described herself as a crazy psychopath looking for her first kill, saying she probably would kill again. Bookey then told her to "have a nice afterlife" and left the trailer.

According to investigators, Bookey initially stuck to her story about being abducted when investigators questioned her. She later said she hated the girl because the girl made her brother happier than she could. She said she knew the girlfriend's mother left her alone three days in a row, the complaint states.

Bookey said she left her house around 4 a.m. on her bike and rode 11 miles to the girlfriend's trailer, investigators stated. She wanted to scare her so she and her mother would move away and her brother would "come back to the family." Bookey confirmed many of the details of the attack that investigators had learned from the girlfriend.

Authorities said Bookey told them she didn't want the victim to die, but that she wanted her to pass out from blood loss so she could leave.

Bookey said she had been thinking about attacking the girlfriend for about a week and a half and planned out how she would do it during other bike rides.

Bookey's mother, Dawn Bookey, told The Associated Press in a telephone interview that her family had no idea that her daughter was apparently plotting to attack the girlfriend.

"We had no clue," the mother said. "There were no signs. We're all very, very sad."

She declined to comment further.