It's very nice of her to help you. I'm sure she wants you to feel comfortable so that if you enjoy it, you'll want to compete again! I don't think that it is necessary to give a gift, but certainly it would be appreciated. When my pro's wife has gone out of her way to help me, I've given her a gift certificate towards a manicure, or to the local coffee shop. It's small, but just a token to show how much I appreciated her help. She seemed to like that.

Good luck on your competition, and enjoy!

I am going to dance my first State competition, I already did a small one. Yesterday I learned from others that my instructor with whom I am going to dance usually gives a gift to her amateur partner in for of a small gold coin. What is appropiate to give to her?