Keep quiet about it. Masturbating in private is a private moment of personal intamacy. It's one thing to play with yourself in front of your partner to turn them on. It's another thing when you do it in private for your own pleasure. If she wants you to know that she is masturbating to turn you on, she will make it VERY OBVIOUS (like "OH God! Get in Here and DO ME!!!").
It would feel like an invasion of privacy if you told her that you know, when she thought she was keeping it to herself. It would be less painful for her to come downstairs and find you rifling through the contents of her purse, spread out on the kitchen table.
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