Retreat and go cold. Don't be unfriendly but show increasing indifference to whether you see her and what you guys do. Essentially, prioritize everything else in your life to her without being a dick about it. If she comes back and does something nice, reward her with attention. If she doesn't, stay your course. If she confronts you, pretend you don't know what she's talking about. You're just doing your thing.
As for her talking about other guys hitting on her, ignore it. It's meant to get your attention and gauge your reaction. By not giving her either, you demonstrate a strong frame and you intrigue her.
Here's something I just posted on a related issue:
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