I think it's really hard to be put in the middle of two professionals like that, and to me, it borders on inappropriate. I think a better direction would be if your PNP has strong concerns, she should speak with your T. You shouldn't have to be the one to justify your T's treatment approach.

At the very least, you can talk to your T and tell him your worries about what your PNP said. He will probably offer to speak with her.