As for your exw, her memory is Swiss cheese. You can see that when she says "oh yeah I forgot x happened." Assuming the therapist has a 1/4 of a brain, he/she is going to know that the problems did not start at separation. Her break with reality was a long time coming. Women who abandon their kids are very, very rare birds.
Thinking of you all.
Me 41, H 47, M 15 yrs, S11, S13 BD 1: 11/4/14 we work on it; really I pretzel myself BD 2: 3/31/15 H goes down to "dorm room" 8/15: H back to MBR 10/15: H back in dorm room 1/18: H files, now divorced