Hit Car In Parking Lot

As I was dropping my sister off at school I accidentally backed into a car in the parking lot. I wrote a note with my info and left it on the car. While I was doing this I saw a lady shaking her head at me and taking pictures. As I was about to leave, after leaving the note, the owners of the hit car came to the car. I explained what happened and told them I’d pay for any damages. They looked at the car, saw a small scratch, and said not to worry. They didn’t seem mad or anything. My question is I don’t know if the lady taking pictures knows any of this. What would happen if she goes to the school or police? Is there any way I could still get into trouble?
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