Jurors determined Anissa Weier was mentally ill during the stabbing in 2014.
The verdict came down around 11 p.m. Friday.
"She was relieved. She cried," Weier's defense attorney Maura McMahon said of her client's reaction to the verdict.
"I'm very thankful for the jurors to take the time to look closely at what really was happening with my client," McMahon said. "I know her family is relieved. It's hard to say when you're talking about the commitment of a very young child, that you're happy. But of the options that were there, this is truly the best one and the right one."
It was a tense day for Weier, knowing she would learn her fate. McMahon said before the inconsistent verdict came in Weier "was shaking so hard, she was shaking me."
The jury's decision means Weier will spend time in a mental hospital, not in prison. McMahon said Weier had agreed that she will not petition for release from a mental health institution for at least three years. She said Weier felt she "needed that time so that she could learn to live in a non-jail environment and that she knew she would need help getting her head straight to do that."
"She will have an uphill road," McMahon said. But she said that if anyone could recover, it would be Weier.
For more go to WKOW: http://www.wkow.com/story/36380342/2017/09/15/jury-returns-to-deliberations-in-slender-man-case-friday-night
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WAUKESHA (WKOW) -- A jury in Waukesha County has gone back to deliberating its decision on whether Anissa Weier, 15, was mentally ill when police say she and Morgan Geyser stabbed a classmate 19 times.
Nick Bohr, reporter for our sister station WISN in Milwaukee, says Judge Michael Bohren didn't accept a verdict that was reached earlier Friday night. The judge said the verdict paperwork was inconsistent due to having differing dissenting jurors on each question.
The deliberations up to that point had lasted roughly nine hours. A decision by 10 out of 12 jurors is needed for a conclusive verdict.
Anissa Weier was 12 when she was arrested for the crime in 2014. Morgan Geyser is also now 15.
The two girls allegedly tried to killed Payton Leutner on Memorial Day, 2014, apparently in order to to please the internet horror character Slender Man.
A defense psychologist Thursday testified that Weier suffered from a shared delusional disorder.
Weier reportedly was in tears as she walked into the courtroom when it was thought the verdict would be announced earlier Friday night.
Co-defendant Geyser has pleaded not guilty to being a party to first-degree attempted homicide. Her trial is set to begin October 9.