I don't think it's ridiculous to follow a therapist to a new practice, especially if you clicked with her. I think it is very hard to find a therapist who fits your needs and that you like. I have never had luck with it (have gone thru at least a dozen therapists).

I followed my primary care doctor when she changed practices because she is such a good doctor, and even good PCPs are hard to find. It's not much different than that, I think.