You are not overreacting in the sense that if you feel uncomfortable with the potential T's possible approach to work, this feeling should be respected.

On the other hand, you don't know if she is going to try to find repressed memories in you or not. Just because she'd written books about it doesn't necessarily mean she'd push the idea that you are a victim of sexual abuse on you. The best thing to do is to see her once and ask her directly about how she practices and share your concerns with her. If there is a certain method you don't feel comfortable with, say it upfront and see how the T responds. Her response will show clearly if she is the right T for you. Why guess? There is no way for you or anybody on this forum to know how this T practices. Just go and ask her and you'll know immediately if you should be seeing her or not depending on her answer.

And your current T's feelings about your acceptance or rejection of her referral is completely irrelevant. Therapy is about you and the only factor to consider is whether it'll benefit you or not.