Since you usually share your dreams with your therapist, I think that it would be good to tell her about this dream as well.

I expect that she will help you understand it, and also reassure you that such dreams do happen.

I notice that at the end of the dream t stops being your therapist. The dream came right when you were under stress due to her absence for vacation. Perhaps subconsciously you feared losing her permanently. But how could that actually happen? Is she so close and reliable that it would take a true disaster (such as the dream) to have her even think of separating herself?

Even then, I don’t think that she would do it. In fact, a shared disaster like that could make you even closer to her, as she would understand full well what you would be going through afterwards.