Are Teachers Allowed to Do This...?

So recently, my teacher (let's call her Jen) told some of my friends and I that we can't play ping-pong over lunch as we normally do. The reason, she said, was that last lunch, some other kids didn't put their stuff away, and she had to do it for them. We explained to her that since we didn't play last lunch, -and there was proof that we didn't play- we should be allowed to play. Since we didn't cause the problem to Jen, then why should we have to pay the price? Jen said that she's trying to create a team mentality in the whole grade; basically that it doesn't matter that it wasn't us, we still can't play because of the others in our grade. We thought that this was unfair, so we went to the principal (Steve). He let us play, and we did, but because we failed to mention that Jen wasn't letting us play he got really mad. Today he called us to the office and asked for apologies etc.. Apparently Jen talked to him and told him that we were doing the wrong thing. We've been playing ping-pong over lunch for a long time, and it's never been a problem. I really want to get rid of Jen as my teacher (I want her transferred to another school). I'm in the Vancouver, BC School district. I'm just wondering if there are some rules that would make it impossible for her to have told us that we can't play. I understand Steve's point. I just don't know if Jen can/could've told us no, because of some other kids.

I know it's long, but any help would be greatly appreciated. :)