Wow! This sucks...for people recovering from PTSD feeling powerless just feeds into the illness. I wish I had some words of wisdom for you. You sound like a caretaker (I'm the same way) Could you maybe leave some of the other clients issues for her to deal with? I know it is disturbing to witness, but you're there to help YOU. Sometimes insurance companies have counselors who answer the phone regarding MH issues, could you call your insurance and see if there are other options.
This guy sounds like a jerk who doesn't belong in a therapy role, obviously he has either pulled the wool over the eyes of the other members of the treatment team or they are just unwilling to deal with him.
I'm curious, have other members of your group commented on these situations? Maybe others would be willing to go to upper with you?
Sorry this is happening...therapists should resolve their own issues before trying to help others!