Well I think it was very responsible of the lady to give you her number and to tell your mum to contact her.
I'm sorry that your mother put you in this situation and you're mother should have never burdened you with her thoughts and negativity.
I think it's great that you were able to look at the situation and really see right from wrong.
Maybe try sitting down with your mum and explaining how you felt with her reactions and tell her your the child and you should not be dealing with this and as an adult she should know this. I've had something similar happen with my family (not as bad), but bad mouthing family members that I have to deal with. It makes it hard when I have to see the other family members at get togethers.
So if I hear my family talk about this or try to bring it up with me. I tell them "please do not talk about this around me, it makes it really difficult for me, when I meet up with my other family and at the end of the day I have to deal with them, not you and please have respect for my feelings". Usually my family tries to justify their actions, but I tell them, "I don't care what you feel about them, or how right you feel you are, at the end of the day, your negativity is effecting me".
If they don't respect my feelings, I get really annoyed and cause a scene - lol! Which is probably not the best approach
