I think this wasn't meant for you, it's just that this person also has problems and maybe a bad day and so on... It has nothing to do with you. In my opinion T is responsible for staying in line with her schedule, not you. My old T started to wrap things up earlier (like 15 minutes) because I tend to say something important when I have to leave Your T could do something similar if she thinks she should.
On the otehr hand, not all T's are the same. My new T... I always have to wait about 15 minutes for my appt because she just doesn't look at the clock, lol. But it's the same for all clients, my session always lasts for more than 1 hour (1,5 hours most of the time, but I'm her last client). When it is the same rule for everyone, noone has the right be angry.