While I agree it is hard dealing with the anger (just read my thread) don't let it control you (easier said than done). At the same time do not roll over for her. Be fair but firm. That's all I can really say. She will regret it in the long run.
Me 41 W 33 M 2013 Suspect A 11/15 Confirm A 1/16 She moved out 2/14/16 Stepson 13 Stepson 16