Ooh, yeah, someone is getting in trouble! I mean, if it was just a misdiagnosis, ok, malpractice will still cover that. But, if the nurse should have referred her to a doctor and didn't, that is major malpractice, and if he lied about being a doctor? Well, he can be sued for many different things there!
I'm sorry your friend had to go through this. That really sucks, but good luck.