I haven't done parts work so I'm sorry if I've gotten this wrong but from reading I thought the goal of the parts work or working with the inner child is that you (the adult you) learns how to sooth the child part yourself... Do you think you could tell the child part that it wasn't her fault? Do you think you could sooth the inner child?

I think I would want to use all the skills I've learned from my T first to try to deal with it myself and then if its still an issue after I tried everything than I would bring it up to T.