My teacher is saying I am using AI, but I am not

So yesterday, my ELA teacher said, “Make your own story.”, and I got excited, because the year before that, I had made a story, so I was like, "Hmm, perfect. I pasted my story in, and then I submitted that story, and the next day she sent me, “This was written by AI, and I am disappointed. I will be messaging your parents.” One, I’m dead; two, I didn’t use AI. Go Guardian blocks everything anyway. How do I fix this? I already informed her, but she hasn’t responded.

Guys please help. This is really scary, and I have seen people with these same problems. I don’t think AI detectors work.

Is their a way to view when a Google document was made?