I would not personally allow it .
My daughter hates me all the time when I say no, but I don’t care. I have the confidence in me that I’m doing my job based on what is best for her.
Don’t fall for “everyone else is going”/doing it/having it etc
Kids ultimately want everything yesterday. Teens want to rush adulthood and wound do anything to be as adult as possible.
Deep down, they need boundaries and feel safe when given boundaries. If they feel they can get away with anything and everything they will quickly spiral out of control.
I would try to be as calm and sympathetic as possible and explain why you don’t want her to go.
I think you posting on here indicates you deep down don’t think it’s a good idea, otherwise you would have said yes by now.
Good luck