Well truly if you can have a discussion about going too fast with your T and she still doesn't get it... start looking for a new one imo.
Not all therapists are specifically trained to deal with PTSD and trauma...and those that are need to be constantly on the uptake of the newest information. Mine is, and I thank GOD for that!
Even if your T is well trained, a talk about going too fast should slow her down. For whatever reasoning, she wants you to heal faster than you can. Maybe she hasn't had too many such patients and they all got better faster, or the insurance is going to run out and she wants to dump all the knowledge she can on you before it does. I have no idea. But going faster only causes some of us to stop in our tracks or even recede to where we had been, some place that felt safer.