That's a good question.... I wouldn't call what I'm suggesting ear training....
@Animisha said that if it's music she knows, it's not an issue (Animisha, please correct me if I'm wrong), but this is music where she doesn't know the original, and she's worried about wrong notes where there's a small change in a chord or passage that repeats. So the first time, one of the notes is an E but another time, it's a C# (for example).
It's hard to catch because it doesn't sound "wrong" the way something would if it was in the key of G major but you played the F nature (for example).
So here, the training required is more about score-reading than ear training... as I'm envisioning it. But maybe that's not the most helpful way?
