I am sorry that your mother hurt your feelings and treated you like that. In my experience people who are not experiencing any mental illness or are in denial like I was (not saying your mother is) but most people have no clue what to say or what it even means to us to be mentally ill. It really is a relatively new thing to even talk about it openly.
The way my bipolar friend explained it to my husband who has thyroid issues is that with medication he can control his mental behavior and I can't. (He gets really angry over the littlest things when he does not take his medication right read: skips it)
When I informed my mother of my recently diagnosed bipolar she just said "huh, yeah I can see that" Mind you I have been this way (the mood swings and all that goes with it) for as long as I can remember and I know I remember some things that occurred when I was 4. Which left me kinda feeling like "You knew this but said or did nothing" There goes her mother of the year award

Yes, it still hurts but I am adjusting.
So I am thinking she is still of the old school where mentally ill means crazy and we stuff that in a closet, not drag it out in the open and beat it down. (I'm working on it) Try not to take it personally.