<human>: Can you condense the text into three sentences or less?

My family recently had a yard sale, which I put a fair bit of stuff into. Now, for the whole weekend, I was at my uncle's hunting cabin, nowhere near my house, which was about a 2 hour drive away. I got together a whole bunch of books, games, and other decent stuff to sell. I told my step mother (if you've seen some of my other posts, you would have seen how much of a bitch she is) that there were some things I wanted to sell, but couldnt, because I didnt have all the pieces for them. She decided to go into my room after I left, take a box that held my gameboy advance SP and about 20 games, then sell it, disregarding the fact that I said I wasn't selling it. She must have screwed me out of some money because when I got home, all that was sold was the box with the gameboy and games, then other miscellaneous games and books. All I got out of the yard sale was $55 (Canadian dollars.) She says all the stuff she didn't sell she "packed away," and to "not go digging through stuff to find it." Since she won't let me see how much of my own stuff she sold, I have no idea how much money I lost. And for the record, I didn't get to choose the prices at which she sold my stuff at. Eg: $20 video games sold for *maybe* $1-2.
<bot>: Step mom takes stuff from my room and sells it when I'm not there, while also screwing me out of the money I deserve.