Singing coach?
Like many questions asked on Mudcat, the answer may depend on what you are looking for. If you give an idea of what sort of singing, it may give clues for people to point to the sort of advice you want.
For instance - if her interest was folk related, in general, people go for an untrained sound even if they are in full control of their vocal ability. Choir stuff, on the other hand, is a different bag entirely.
Quack!
Geoff the Duck.