OP. I’ve read the full thread and am slightly confused. What are you here for? To simply vent about the situation? Or for people to tell you their honest views?
Because reading your full posts, you’ve become incredibly defensive very quickly. Thinking some posters are randomly saying LTB, without foundation. Or because it’s easy for them.
Here’s the thing. They’re not. This is an extreme situation (and it is). I absolutely appreciate those saying empathy needs to be given to SD as mental healthy issues are not in her control and I whole heartedly agree. That however does not make this situation any less extreme. To cope with this and justify staying, you have created a narrative and cling to said narrative; part of that being psychiatrist saying she’s not a threat to someone else.
In my mind that’s a psychiatrist playing god when a young child and animals are in this home environment. Newsflash; psychiatrists are not god and nor do they know how someone’s mental health can turn/ be triggered.
However, I hope you recognise that you are getting defensive because posters are (rightly) challenging your narrative that allows you to justify staying.
Now ultimately, this is your life, your home, your cat/ kittens and your daughter. You have every right to continue to manage the situation and best case scenario - no other person/ animal is physically harmed by SD. Everyone (including your 4 year old however) categorically will bear mental / emotional scars through exposure to this behaviour.
Worst case, this turns. And if something does happen? The first people/ living beings that will be removed from that environment will be the 4 year old and the animals. To which you will no doubt say, well I would leave with my 4 year old, if that happened.
Well if you would. It begs the question why you wouldn’t now. The stakes are high here OP, and I cannot fathom how your ‘love’ for your partner trumps the realisation that your 4 year old needs to be removed from this environment.