As stated above, practice makes perfect. Encourage her to do it by always telling her how good it feels and how good she is at it and how much you ejoy it. Don't push the issue. The more she practices at it and does it, the better she will be at it. Be sure and let her know what feels good and what doesn't feel as good. Remember she is not a mindreader. Most of all, be squeaky clean. Let her practice on you al she wants.