Tell the whole truth about what happened. Be totally clear that you only made out with her (or whatever it was you did--your OP was slightly vague on this point. DON'T BE VAGUE WITH HER, or she'll make up that you had three-way anal with the girl and her cat). Tell her that you have no feelings for this girl, that you're not dating her. In other words, her instinct will be to assume the worst, and you need to head that off at the pass.
Don't confuse that with trying to have it not be a big deal. It's a big deal. She gets to say how big. I'm just saying you need to talk about what ACTUALLY HAPPENED.
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