A student in my school submitted an "assignment" pretending to be my original work, I am absolutely FUMING

Throw away account because it's about specific details of my school and my students. This happened a few days ago, and I am still fuming. Luckily I have amazing colleagues supporting me and telling me I don't have to put up with this nonsense because I am a human being, but I've genuinely never been this mad in my entire life.<br><br>This is my second year at this school and I teach languages (10-18 year olds). This year I was given a few new lessons to teach, so I had a lot of planning to do. In one of those lessons, I did a lesson on "the future" and used "Tomorrow, and tomorrow, and tomorrow" by Shakespeare (a 13-line poem) as a starting point to a discussion about what the students thought the future might look like and whether it would be dystopian, utopian, or a mix of both. I uploaded my entire, very fancy powerpoint I've made to our online platform, where the students can access them at any time. In this case, it meant they could look at the poem again at home because they were so fascinated by it that I told them they could refer back to it whenever they wanted.<br><br>Next class, a girl walked in and gave me a beautiful bound "book" that was supposedly her "assignment" for the lesson. I read it and thought it was really weird, because it didn't make any sense. Then I opened it up and and it was...my powerpoint. Word for word. Unabridged. The student had literally printed out my powerpoint, bound it, and submitted it as her original work. I asked her what on earth she had done, and she said that she thought my lesson was so beautiful she wanted to gift it to me.<br><br>Excuse me? I get gifts quite a lot, but this was not a fucking gift. I was absolutely mortified. First I sent the book back to her and told her this was not okay, and she looked at me like I had grown a second head. Then she told me that okay fine, she'd resubmit it as her assignment, and I told her no, she can't do that. I went straight to my colleagues and told them, and they were horrified. I asked the girl to come in after school and I explained to her what the hell was wrong with what she'd done, but it was like talking to a brick wall. She just looked at me like I was a freak and I could tell her parents were waiting outside the room.<br><br>Her parents then came in, and I told them exactly what happened. And I kid you not, they told me I had "misinterpreted the situation". That their daughter wanted to show her appreciation for me, and that this assignment was "a thank you". They took her "assignment" back off me and told me they would resubmit it, and when I told them she couldn't do that they got into a fight with me about it and how I had no right to talk to their daughter like that, and that she could absolutely do that, it was her assignment. And I'm sitting there in a room with these three people, trying to explain to them that all of this is not okay because I, a teacher, put my WORK and TIME and EFFORT into something, and one of my students thought they could just steal it and claim it was their own and then just...gift it to me, with no repercussions. And everyone in the fucking room was against me.<br><br>I have spoken to my head of department but she's said that, unfortunately, as I am a relatively new member of staff I have to grin and bear it. The girl has "apologised" (she literally just emailed an apology to me and that was it). I am still fuming and I don't know what to do. I feel violated, honestly. Nobody seems to care that this kid literally STOLE MY WORK, PROPERTY, and then tried to submit it as her own. I have spoken to other colleagues and they're all horrified and told me to do whatever I can to make sure this kid doesn't get away with it, but nobody has my back. I really don't know what else to do.