Exactly right! She is an emotional mess right now. As Chicki says don't believe anything she says. She will say anything to justify her position and her cruel rants and taunts are part of that. If my H rants, I leave the room. I drew that line sometime ago although I am fully prepared to talk/listen if he is calm.
Congratulations on the job! What a wonderful boost to your PMA. Why should you tell her until you need to? A bit of mystery and suspense won't harm the situation.
