It seems the ex has ALOT of issues so you are a good friend to encourage her to get help. However, I wouldn't hold out hope she will ever become "normal" enough to have a "normal" relationship with you; if she does, great, but don't set yourself up for disappointment as her problems seem extensive. And the suicidal threats are often a form of manipulation, so try to be supportive but distant emotionally as no one can save her but herself.
In the meantime, have you had any dates, relationships? Are you perhaps hanging on to a hope in the last 2 plus years? This type can keep you spinning with her own hang-ups, so I'd make an effort to move on.