I fully believe that you need to continue pointing out to her her own bad behaviour - it's ok for her to not really forgive or believe you yet, but it also doesn't excuse her OWN bad behaviour - and talking about you to others is just not appropiate. At least if she's just saying it to your face then it can be seen as honesty, but talking about you and your history together isn't appropriate in front of other people.

You don't have to talk to her about things in depth - but letting her know when you have a tentative diagnosis or an official one might help. You don't have to go too much into detail yourself, but you could always find her a website to read.