After every sentence she says. She will have no choice but to shut up. OR turn the tables and sob uncontrollably. She will them apologize and make you a sandwich.
That's what I do when I find myself in an argument with a difficult person. It usually works pretty well. And we all win because they get to think they are right, and I don't have to hear anymore of their arguing.
It isn't necessarily a happy joyous union, but we at least get along MOST of the time. I secretly hate women who act like drama queens because they give the rest of us a bad rep.