I would politely tell her that there is another class you have to show her. Explain the quilt is not done, you have this much fabric in it & you would like to split the profit. Since you seem to be doing all the work. I hate it when people take advantage of me because I don't speak up. But like I say to others, there's a way of telling them, it doesn't have to be rude or bossy. Good luck with the end results.