No it does not sound like malpractice. It does sound like she violated boundaries by accepting expensive gifts and officiating a wedding. In doing this tbe lines got blurred until she became frustrated that she wasn't getting paid - then she tightened them and now you're hurt. Terminating over non payment is not malpractice from what I know, she is a professional and should be paid. The prescription situation is out of her hands, they are controlled substances so i think her advice to go to the ER is what other doctors woukd do.

The boundary issues are different and i suppose she could face disciplinary action if you
wanted to file a complaint. I have no idea what the consequences would be, but I'm guessing they wouldn't be too serious. Unfortunately she should have had more professional boundaries from the start, but I don't think that excuses your obligation to pay her.