I'm going back to my workmate a couple of pages back. I'm aware she has some significant problems of her own.
There's reasosn people stop talking. Life, events, circumstances, etc.
As Fetch Fletch says, it's always a two way thing. In my workmate's case she has to do her bit and it not's just up to me. I did try to reach out and she has turned out to be totally inflexible - I remain the blame figure despite doing nothing wrong and she did plough in before getting her facts straight. It was the same with a lady I was seeing last year. It was me trying with no effort on the the other person's part when things went wrong. I thus had to walk away in the end for my own wellbeing.
In your case, your friend didn't want to reach out initially from what you have said. But if the break has reset something then there's a chance to keep talking and slowly repair things. And now you're talking, you can slowly nugde her in the right direction of seeking whatever help is needed.
Take things slowly, one step at a time but be there when needed for her to talk to. Handled the right way, things could work out okay.