If the lady comes over again , because she got back with the guy threatening her and is scared, them refuse to let her in the house and call the cops. Some people cannot be helped. I had a female friend with a drug problem that continued to ask for help after her boyfriend would abuse her. After the third time of her going back to him, (and me receiving threats as well) I told her I would only help her out by bringing her to rehab. If she called for any other reason I would hang up.
Luckily she called and agree to let me bring her to her parents house so they could have her committed into a rehab facility. If she would have called for any other reason I would have just written her off. But some people can't be helped, and helping them in any way just drags more innocent people into their mess
(and I guarantee you they don't give a rats *** about your well being at all)