Tell her. She's gonna find out anyways, and if she does find out on her own, she's gonna hate you for keeping it a secret. Knowing yourself is the first step in changing yourself.
At this point i would've liked to say "Know thyself" in Latin to emphasize my point, but I don't know the phrase in Latin. Damn it. Need to go watch The Matrix again...
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"Yeah, so this one time, I tried playing poker with tarot cards... got a full house, and about four people died." ~ Unknown comedian
Happy New Year from WP's resident fortune-teller! May the cards be ever in your favor.