Ummm... there are strategies that will help. For instance, communication and co-operation are what worked best for me (us).

Can you talk to teen? If not, can you talk 'at' her? (Meaning, just say aloud (or in your head, whatever) that you need to go to T tomorrow and you respect that she may too have things she wants to talk about... but there will have to be some co-operation and collaboration.) Is it possible that you go for the bulk of the time with the understanding that teen has five minutes or so somewhere in there?

I guess the conflict is... these two parts of you both have very real needs. How can you work to get BOTH of those needs met? Not either/or... that can sometimes end up in a battle (read: takeover!)

How can you work together, and both feel 'heard' in the outcome?

I /we are having a similar battle in our therapy at the moment. I want things to go one way, another part of me wants things to go in an entirely different direction. I know I have to come to some sort of compromise on that, although I really don't want to, because I really truly rooly don't want what that part wants.

I don't know how my therapy will go tomorrow either! Good luck with yours - hope you and teen manage to reach a mutually satisfying outcome!