Well, unfortunately, Ive got some bad news. She nipped a couple more times, and my mom felt that she wasn't safe to have around our house. So she contacted the foster, who was understanding, and she went back last night.
I only had her a couple days, and I could have worked with her, but my mother didn't want to take the risk. I miss her so much already. I think I'm going to just wait for a while before I look for another dog. It was almost like having to put a dog to sleep. Argh. I just wish my mother would have listened to me about this. Almost all herding breeds can nip and she wasn't being aggressive. Oh well, there is nothing to be done about it now.