No, I don't expect the original posters mother to behave like that at all. She is entitled to her own opinion, I just don't think that it is fair to express it that way. I don't think that it is fair for her to say, "Oh I hope you break up with her soon". If the original posters mother doesn't like the girlfriend then she must have a reason, it could be a personal reason, it could be something that isn't personal like in my situation. I just don't think it's fair for the original posters mother to turn around and say that to them.
If my mum had a problem with my boyfriend then I wouldn't care. I would never say something about someone she was seeing because at the end of the day, it's none of my business. My mum is a single woman, she could go out and find a guy that I might not like but I would never tell her to break up with them just because of my own personal opinion. If that person makes my mother happy then why would I take that away from her? It's her feelings that matter, not mine. Therefore, I do believe that it is the same in this situation. I wouldn't take that from my mother because I wouldn't give it out personally, I would never say that to someone and I don't think that anyone else should.
I think the original posters feelings about this girl is much more important that the mothers. The original poster is the one that is going out with her, there must be a reason why they are together, therefore she can't be all bad. If this girl makes the original poster happy, why stand in the way of that? You shouldn't. Thats how I see things, everyone will have different opinions on it and thats mine. You don't have to agree with me, I just think that in this situation that the original poster deserves to be happy and if this girl makes them happy then the mother should leave them to it. She shouldnt stand in the way of their happiness.