Well she's been evaluated by several people and been hospitalised for years and the hospital diagnosed her with bipolar II.
What evidence is there that she had psychosis? None imo
There often is no objective evidence that can be pointed to and it's retroactively diagnosed. The entire picture points more to her ending up in an acute psychotic state.
What evidence is there of a personality disorder?
Like Constance Fisher, she made an attempt at suicide but didn’t make sure she died like she made sure her children died.
She very nearly did die. If she hadn't paralysed herself and been able to try again I'm sure she would have.
Chris Watts tried to blame evil spirits for him murdering his pregnant wife and children. Nobody thought he had psychosis.
Chris Watts had a motive and he didn't try to kill himself after. He also didn't have a mental disease or defect that led up to it, I am sure that many men who kill their wives feel similar at the time, like some kind of temporary insanity coming over them but there's only a legal defence if it was a mental disease or defect that caused that to come over them.
He is basically saying at the time that he could not control himself, but if someone is out of control due to rage, wanting to start a new life etc. as I said a lot of men do feel like they had some temporary insanity come over them, and some of them probably are in an extremely abnormal mental state during a killing and when they're out of it they feel like that wasn't them and they weren't themselves, but if the state does not come from mental illness, and comes from other things like just wanting to be with your mistress then in some ways their internal experience might feel or look something like psychosis even though psychologically and legally it isn't.