Based on what you said, I am wondering if you may have been dissociating when you left the session. That's something that I may talk with your therapist about. I'm seeing a T who does EMDR and something that he's talked about with me is making sure that I'm in a stable place when I leave, for a variety of reasons, least not safety (since I drive).

I agree with everyone else that it doesn't sound like your T is planning to leave you. The opposite, actually. It sounds like she's committed to doing the work with you at the pace that you're able to handle it. I hope that things go well for you.