She keeps starting discussions with me about whether or not she is mentally ill and how unfair I am on her. Frankly I feel uncortable about getting into a debate on menatl illness.
Just wanted to mention I would be uncomfortable with this too. And I remember these well.
Tread carefully on this - sometimes these conversations where the person OS looking for you to say "No you aren't crazy" have longterm ramifications. It can get twisted up real fast. Either looking for an out or an excuse. Denial is a self protective thing.
Check out how to validate her feelings properly while not validating the invalid. There's a workshop for it thru the staying board lessons.