If you think you're a master, teach her gently with the way you kiss. Don't say anything to her about it, actions speak louder than words. And remember, it's perfectly possible she thinks YOU are a bad kisser!
Melos deserves a point for such a great answer! I am not really improving his answer, but just adding mine.
Obviously we would not tell a woman that she is a bad kisser, right? ;-)
What worked for me once was: I told her I was going to kiss her and she must not kiss back. So I started kissing her my way. Slowly, gently. When she realized what difference it made to kiss like that, she sort of adopted that style and just got better from thereon.
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