In the first place, the conviction was overturned because of a problem with one of the expert witnesses. Not because the appellate court thinks she's mentally ill. Secondly, she is NOT going to be released from prision. She's still a danger to herself and others. They will most likely retry her, but she'll spend the time either in a jail/prison of some sort or a mental hospital. Since she had a clear and long history of mental issues, its my wish that the prosecutor will agree to having her committed to a mental institution for the remainder of her life. While she may not be suicidal at this moment due to the medication she's on, she has, at least three times in prison already, either talked about suicide or tried it.
As another poster said, since Yates' trial, at least three mothers who murdered their children have been found not guilty by reason of insanity. Two of these women had absolutely NO history of mental illness whatsoever. If Yates doesn't fit the definition of mentally insane, its worthless in my opinion. I don't believe she should ever be free to walk amongst us, but neither should she be in prison either.