Yes, I think it will be a wonderful conversation you and she will have. I think it is great that you are thinking of these things the way you are. The other side of the coin is that I saved my life in 2003 by figuring out what treatment I needed and "making" my doctor try it. It had been five months and many dollars and doctors and I hadn't gotten a correct diagnoses. My husband just accepts what the doctor tells him, does not look at how it affects him at all.

I would not think of it as challenging your T's credibility, you can't really do that unless you are another T in training and experience? You are just trying to better understand how it all works and what you think and feel about how it all works. If you are not comfortable with how a T does something, don't "agree" with it, you have to decide whether or not to see another T and getting all the information you can is important.