Pretend to get a phone call on her cell (she says the phone is on vibrate), says it is an emergency and she books it out of there.

On the other hand, is there any way for her to use her powers to cause a big distraction? Like a car hiting a tree or a tree falling over or something?

Or, something unrelated to her happens that causes a good enough distraction for her to get away? Better to be lucky than good and all that...

Also, you've set up a very interesting situation... ;-)