Mental illness does not completely deprive people of the ability to discern right from wrong or to make decisions.

It depends entirely on the type of mental illness you have. There are some where you have hallucinations and you might be seeing a giant snake that wants to eat you, and you grab the first thing you find to hit it and defend yourself, only to find out it was a person. We have to be careful with generalizations.

she did receive treatment for her illness (it wasn't a case of neglect), but she deliberately refused to continue long-term treatment, knowing the potential consequences due to her training as a nurse

That's not entirely true. From what I've read, she was never diagnosed with postpartum psychosis; she was treated for insomnia. What is true is that she was constantly changing medications. Over the months she spent seeking help, she visited several professionals, some of whom suggested she might have bipolar disorder and only one said it could be a postpartum-related issue. She constantly sought help, especially because of thoughts she had about harming her children, something she discussed with her family.

Neither postpartum depression nor psychosis makes everyone who suffers from them a murderer

You are right, but up to 4% of people with postpartum psychosis end up harming themselves or other people. That's why it's so important to get the right treatment on time. Another thing, the episode can be triggered in an instant, you could be perfectly fine in the morning and by 12pm you are thinking that someone is trying to harm you and that you need to defend yourself. Or maybe you think that someone is trying to kidnap your baby, and to try to protect them you run away with them.

Mental illness is not a free pass for your inner demons to harm others. And we mustn't forget that.

That's totally right. She will face consequences for what she did. The difference is between going to jail and going to a psychiatric hospital; in both cases, she would be there for life.

What's important in this case is the legal aspect of the verdict. If she's found guilty, those who already want to take away women's rights will use that to claim that women aren't capable, whether they allege that women are hormonal, unstable, or anything else. I think that's why she's receiving support, because it's not just her life that's at stake.

Another thing that could come up from this is the fact that they may try to target people with mental problems; there have already been cases in which people declare them incompetent and they keep their assets.

Oh, and keep in mind that postpartum psychosis is not recognized as a diagnosis in the DSM-5, so that means that even with the evidence and studies carried out, it still needs to be recognized as a mental disorder