Unfortunately, yes. People will hold grudges. We are dealing with a son / dad issue right now. Dad doesn't understand and is really mad at my boy. (bad manic episode and some REALLY hurtful things were said on both ends.)

Just my oppinion; you did the right thing. Appologising really puts the ball back in her court and lets her know you want to try at the relationship.

I am so sorry. I really am. It hurts so much when family doesn't understand. I realise you weren't dx'd at the time, but it still doesn't make it feel any better for you.

HUGS.
I hope she writes you back.