RECORD the conversations, and PLAY them for the C, and see what she says. It's ABUSE -- period. If she doesn't agree, then get a new C. Puppy
Do what Pup suggests but play them for K's C with W there. If there is to be a "family" discussion of the demise of your family, then the C should definately be willing to play moderator. You have to beat W at her own game Lost. She is spewing and the only control you have in the situation is to make her responsible for her spew by confronting her with it in front of the C. She wants to play grown up games, so let her be a grown up.
M:39 H:39 K:S14;D8 T:22yr M:15yrs S:12/28/07 EA/PA 3/14/08 OW preg 11/17/08 born 12/12/08 his ~~~~~~~ Never allow someone to be your priority while allowing yourself to be their option