We dated and lived with each other and were very close for 5 years straight. She left me 5 months ago with no contact and I'm still not exactly sure why, kinda gave up wondering about it. It was a few months after I caught her cheating again.

Anyways, 1 week ago I get a call from a animal shelter asking if I want to pick up our cat that she dropped off and the lady on the phone told me she was crying and the police were called and showed up and took her to the hospital.
Immediately after that call, idk what to do so I call my mom for advice and she suggest that I call my Ex's parents and let her know what happened in case they were unaware of the situation. That's what I did and that's when I found out she got kicked out of her friends place, threw away every single thing she owned in a dumpster, went to drop her cat off at a shelter, and then was going to take her own life. I did not contact my Ex, I just told her mom what I heard and knew my involvement was over at that point. I did however anticipate us possibly talking and what that might mean for me and her.

3 days after my ex calls me very late at night and tells me what happened and that she's sorry for many things. I tell her it's okay and that it's good to hear from her and ask if she want's to get coffee the next day, she very quickly said yes and started crying but I was trying to diffuse that and just talk about something positive... we ended up texting like friends for hours after. We met today for a 2nd time, right after her therapist appointment, on her own accord.

These chats and meetups have been very light and casual, nothing romantic or sexual nor is that what I want. What I want is for her to be happy and healthy which, in the big picture, is probably without me (likewise for myself) but right now I'm trying to support her as she is in a very rough spot and was going to take her life last week.

I'm pretty sure her therapist isn't suggesting we talk and see each other but maybe her therapist is focusing on much more important things and hasn't got that far yet. I wonder if us talking is actually doing more harm than good and still don't exactly know why she wants to reconnect. I'm trying not to pry or put ANY pressure on her so I'm not asking those kind of questions yet.

She still feels like family to me but the most important part for me is her own health and safety and that worth more than anything else, especially regarding her life. THANK GOD, she's still consistently doing therapy (she loves her therapist) and medicine (Prozac) I feel those are absolutely the most important things in her life and if her therapist says no contact with me, I will absolutely respect that for the sake of her well-being.

I think she is reaching out simply to see what happens.

What do I do?
How far would you go to help a Ex that is at a high-risk of suicide?
Why may she be reaching out to me at this point in her life?
Any thoughts or advice?

TL,DR: Ex with BPD is reaching out to me, idk why or what to do but think she could use some emotional support.