hayley I'm so rude I'm sorry, I came on the thread with the intention of responding to your OP and instead started asking questions of my own. Hopefully this is closer to a response for what you originally asked.
My experience of psychosis is not personal but as I said viewed through the eyes of a close relative. She has had roughly ten psychotic episodes across eighteen years I would say. They have tended to be triggered by something external. Usually for her it is drugs - I know we have mentioned weed but amphetamines seem to be a dreadful trigger also, as does extreme stress. Do you know if you have any triggers?
Prior to the psychosis she usually takes a recognisable noticeable downward spiral. Makes less sense, pulls away from those trying to help her, makes contact with and spends time with people she wouldn't normally, loses inhibitions, gets into arguments because of very plain speaking, makes questionable decisions. This can take a few weeks or months to lead to a psychotic episode. The last one was much quicker than usual with fewer warning signs though. However if she was prepared to modify her behaviour or engage with the teams once this was highlighted to her these would actually be useful signs and provide a way of managing the situation.
I can't say if you will recognize any of this as I don't know if it's the bipolar or if it's her behaviour that then aggravates the bipolar and brings on the psychosis.
She had a spell of many happy years free of psychotic episodes so it does seem possible. It sounds like you are much more engaged with those trying to offer support, you believe them rather than pushing them away, you aren't doing anything that will specifically aggravate the situation. A few assumptions there but I think your situation does sound very hopeful in my narrow experience, you are certainly doing all you can. Thanks OP and others for your thoughtful responses to my hijack. 