I know that there are others here who have told their T's that they love them. You might start a bit smaller than that, and try saying that you've been feeling really close to her, or have been thinking about her a lot, or something along those lines. She would probably consider the "therapeutic relationship" to be worthy of talking about in itself. There are some schools of thought that think many important insights can be gleaned from looking at the relationship between therapist and client.

Generally speaking, you should be able to say anything to your T that you feel like saying. I do think it can feel safer to kind of tiptoe into it sometimes.