Really simple situation, but I don't want to seem rude?

I went to the movies last night with a friend and her family. I offered to pay, but her mother refused. I felt bad because they bought me popcorn a drink (which I didn’t even ask for) and a ticket, which is actually a lot of money at the theatre. I offered to pay quite a few times, but she kept saying no.
I had with me, twelve dollars dollars (two coins-I’m Canadian-and a ten dollar bill) when I got home, the ten wasn’t in my pocket anymore.
I think it could have fallen out in their van on the way home because I took my mp3 player out of my pocket-the same pocket the money was in.
But because they were the ones that payed for my ticket and everything, I’d feel bad calling and asking if the money fell out in the van-but I also am only 15 and get a very small allowance and have a hard time getting a job, thus, that ten was about all the money I had left.
I don’t want to seem rude, offering them my money and then suddenly asking for it back.
What should I do?

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