Whether it would have been enough for her to stay if I'd offered to go and live with her or stay for a while at least. I didn't know until afterwards what she was going through. Dad's long term life partner, although complicated, but she was practically family to me up until my thirties when I cut contact with them.
I struggle to consider hers an informed decision given she was in a psychosis shortly before. She set up a standing order for holy water as she thought people were performing satanic rituals. My sister found that hilarious. I do see a funny side in those words but I find nothing funny about the abject terror that can come with psychosis, as I've experienced that twice myself, and know it can be terrifying.
I don't think me moving in with her would have been enough, given her eventual circumstances so I think I know the answer but I still do wish I'd been able to at least ask that and establish her levels of mental capacity around this decision, given the psychosis she'd experienced.