Hey Jinx, how is your daughter doing? Any updates? I am very sorry this happened my friend.
Jinks,
I didn't bother to read all the ridiculous posts on this thread, but don't beat yourself up. It could have happened to anyone. Armchair quarterbacks are rampant on the internet and this forum.
Honestly, I don't blame your daughter, I wouldn't have worn that jacket either. I know it is hotter in Florida than TN, but let me tell you, it has been at least 97 degrees here with 80-85% humidity. Absolutely miserable, I start sweating being outside for 5 minutes.
Everyone preaches gear, gear, gear, and hey it is great and does protect. Anyone short of the devil couldn't stand riding in that type of gear in this heat, there ain't no way.
Your daughter loves you and she knows it was an accident. Don't punish her by not letting her ride with you again and don't you be scared to let her ride with you again. It was an accident, the only thing you will teach her by not letting her go is to be scared of motorcycles in general. It will also teach her to be afraid of everything if she gets a bit scuffed up or scared.
Put her back on the seat when she is ready and you don't be hesitant to ride with her. Just ride normal and slowly work your way up with her. She will hold on tighter next time and I am sure she learned to not let go of her grip while she is on it.
You did nothing wrong, don't even give it a second thought.