Thats AWESOME news Rachie!
I don't think it's wrong for you to feel happy that your mom felt it's her fault - at least that's what some of the psych theories say - all of your problems are related to your childhood!
But here's your chance to be supportive of your mom.
Just tell her that you know she did the best she could in raising you, and together you both will get through this.
Hooray for you on some really good news!!!