As I read your opening post, I had the same thought cross my mind that most everyone else here has expressed: your teacher let you down. I know that
that is exactly how I would feel if my teacher had booked me a gig, and then not follow through on making sure I received fair pay for my performance. I would have felt abandoned, and
used, by both the teacher and the party host.
I'm so very sorry this has happened to you, but even though this has been a bad experience for you, you have learned a lesson, and since you now know how this kind of thing feels, you know that you would never want to be guilty of ever doing the same thing to someone else. In fact, you have gained a very valuable experience to pass on to other newbies, such as myself. Thank you for sharing your experience with us, and know that you have people here who care about you.
*BIG huggles*
Perhaps it's time to consider finding a new teacher?
Of course, before you do, you might want to talk about this whole thing with your teacher. Just because a person is a teacher doesn't make her perfect. It sounds like she could use a few lessons on how to make sure her students are treated well. Of course, don't approach her in anger, but do let her know that you have been disappointed by your experience. I hope you can work things out so that you can continue to grow in the dance, and leave this bad experience behind.
Eshta, I'm sorry; I'm not allowed to give you more rep, but I certainly would have if I could.