Am I wrong?

My friend son, age 6 broke the pole to my kids trampoline by hanging on the basketball goalie when he knows not to. So I decided no more extra kids on the trampoline to avoid anything else like this happening in the future. The trampoline is less than a year old and I had to pay for a new pole so it can be fixed. She didn’t offer to replace the pole or at least go half. I’m sure she will feel some type of way once she comes over and I tell her no more kids on the trampoline unless they’re mine to avoid anything else happening like this.