If I were you, I’d be worried about this friend. It sounds like she isn’t doing well and you know she has a history of mental health problems.
I’d be reaching out to her and offering an opportunity to talk if she wants to, but without pressure.
But I wouldn’t be offended if she doesn’t take you up on it because it isn’t always about you, it’s often about the other person.

Just my thoughts. I’ve appreciated when friends have provided an open dialogue without pressure.