Sorry to hear about your girl. Serves the bullies right that she's enjoying the warm. I'm reluctant to bring mine in because even though I keep my house at a brisk 62 degrees, it's double-digits below zero out up here, and I would be worried about the temperature shock she would experience when it's time to go back out.
Of course, I have one "upstairs" cat and four basement cats, so my girl probably wouldn't rest too well in here.
I'll try the Dawn and vinegar (plain old white vinegar, I'm guessing).