It sounds to me like she is really ingrateful! And that she is taking advantage of you!
Does she only call when she wants something? It's obvious that she is either really cold and careless or just not all that bright. I'm really sorry that your grandchild has to be raised by someone this selfish. If I were you I wouldn't help her anymore... and if she calls to ask you for something, just tell her why. Even though it is ideal to have a relationship with your children's significant others, you can still have a relationship with your grandchild without being really close to it's mother. I hope this is just one of those pregnant hormonal phases, for your sake. You seem really sweet and it just sucks when nice people are taken advantage of and treated badly.