Okay, being ready for termination isn't at all boring, if anything, it's more exciting, but I doubt that you are boring either!

I don't think she would have remembered and gone through the can't-open-the-door-and-hug dance if it were about boring or wanting to go on to someone else. It could just be that she's having trouble catching up after vacation and might be taking it out of those she is more sure of; I would point the time thing out to her, not with assumptions of your own (because you can't know unless you ask her) but just to let her know what you're seeing. She may not be noticing it (your 8 minutes left and her immediate "sit down again" responses), that it is happening both ends and each week.

If she starts the session late next week, mention it to her.