H....you can stand you ground on what your issue is (for example not signing the papers) but not accept her yelling and screaming at you when she doesn't like it. IMO the two are mutually exclusive. Let her know it will no longer be tolerated, establish a boundary around it and what you will do if she chooses not to respect your boundary. That boundary could be that you will no longer stand there and listen to her spew.
IMO she wants to pick a fight and get a reaction out of you because maybe that is what you have always done? When this happens maybe it re-enforces in her mind why she wants to get a D?
