How should I respond when my daughter uses AI on schoolwork but the allowed help is unclear?

The paragraph used a word my thirteen-year-old couldn't explain. When I asked where it came from, she showed me the AI conversation beside her draft.

She had typed her points and asked the tool to make them sound more formal. Some sentences were edits; others added ideas she hadn't written. She says that isn't different from asking me to improve a sentence. I have done that before.

The assignment sheet says the argument should be the student's own. It doesn't explain which tools are allowed or what help must be declared. I don't want to invent a school rule, but I also don't want her handing in sentences she can't explain.

The draft isn't due until Friday. My first reaction was to ban the tool and tell her to start again. Now I think we need to understand what changed in the text and ask the teacher about the boundary. What would you do with this draft while waiting for that answer, without deciding that every edit is cheating or every supplied paragraph is harmless help?