Ask a few "what if" scenario questions to see if you and the possible coach click on teaching theory. How someone teaches is equally important to what they teach. If they repeat the same thing over and over but you need a different approach, then you two might not do well together. Ask her, "if I am not getting it right, how would you help me understand?" The catch here is that you need to know enough about your own learning style to appreciate a good answer vs a good answer for your style.