Honestly, the only way to deal with a crazy bitch is to ignore them. If you show you are annoyed in any way they'll keep on getting more and more crazy towards you. Don't worry about her trying to turn your friends, because if your thinking she's crazy, odds are they are too. Don't talk to her, don't show any emotion whatsoever to her actions, and just let the crazy bitch burn herself out until she goes somewhere else.