I have a 15 year old daughter, at what age should she be able to go out with friends to party from 8:00-1:00am?

We just couldn’t bring ourselves to let her go to her first party tonight so she went to her friends house to watch movies instead. I already talked with her friends grandma and it’s been confirmed that yes they are just watching movies tonight. And not sneaking out to the party! Back in the day I used to go to parties since I was 13! But times have changed laws are much stricter and people’s morals are much looser! So how long should I wait to let her go out and party with her friends? At the lake or at a house party