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(CBS News) WAUKESHA, Wis. - One of two 12-year-old Wisconsin girls charged as an adult with stabbing a classmate to please a fictional online horror character is mentally incompetent and can't stand trial, a judge ruled Friday.

The judge also ordered that she be committed for treatment, and said that attorneys have a year to restore her to competency. He acted after receiving reports from two doctors and hearing from attorneys.

The girl's attorney previously said he believed she was mentally ill and a primary goal would be to have her case moved from adult to juvenile court, where more mental health and other services might be available.

See also:Police: Girls stabbed friend to summon 'Slenderman'

Wisconsin law requires anyone age 10 or older to be charged as an adult in severe crimes. The accused girls are not being named because both of their attorneys have said they will try to get the cases moved.

According to court documents, the girls plotted for months to kill their friend to curry favor with Slenderman, a character in horror stories they read online. They allegedly told investigators they believed Slenderman had a mansion in a Wisconsin forest and they planned to go live with him after the slaying.

Dr. Brooke Lundbohm of the Wisconsin Forensic Unit testified Friday that she interviewed the girl in June. The girl claims to see and hear things that others cannot - including unicorns, Slenderman and Voldemort, an antagonist in the Harry Potter series, Lundbohm said.

"Despite our very serious conversation, she would laugh almost hysterically," Lundbohm testified, noting that the girl squatted on her interview chair and was in near constant motion.

Could it?: Could a fictional Internet character drive kids to kill?

A psychiatrist hired by the defense, Kenneth Robbins, testified that girl was more concerned about her relationship with Slenderman than she was about going to prison. She said she communicated telepathically with the fictional character and feared he would harm her or her family if she said too much about him, Robbins said.

"For her, these are real characters," Robbins said. "She sees them and they have discussions back and forth."

The girl who was found mentally incompetent hosted the other two at a May 30 slumber party to celebrate her birthday. The next morning, the two girls attacked the victim in a wooded Waukesha park. The other suspect told investigators that she told the victim to lie down and be quiet after the stabbing so that she would lose blood more slowly. The girl said she hoped to convince the victim to be quiet so the victim would not draw attention to them and would die.

Once the attackers left, the 12-year-old victim crawled from the woods to a road where a passing bicyclist found her. Doctors later told police the girl had narrowly escaped death because the knife just missed a major artery near her heart.

The victim has since been released from the hospital and is recovering at home. Police have not identified her, and her parents asked friends to keep her name secret.

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