I wonder why therapist #1 didn't say "I told her she didn't have to go" when therapist #2 was being such a butthead? Can you go next time, and speak with therapist #1 and ask her to clarify the policy on outing attendance, reminding her that she told you it was not mandatory? If she again repeats that, I think you're fine, and if therapist #2 continues to hassle you, just refer her to therapist #1. I can see how this is stressful for you.