I think it is great that in the short passage of time on this thread that you have conceded you need to adjust your parenting style.
Having boundaries is not the same as being hardline, my way or the highway.
I totally understand your anxiety about her sneaking out and your frustration that she does not appreciate how worried it makes you.
Teenagers’ brains are still forming, their capacity for empathy is literally impaired. They are biologically designed to be selfish and to push boundaries. It can be an extremely painful time for everyone in the family! But it is nature at work, she is flexing her independence and she has to do this in order to become independent.
At the same time, maddeningly, she is very much still a child who needs her family as a soft place to fall.
The way through is communication and mutual respect. Easy to say, not easy to achieve.
In my experience the most important thing is to listen more than talk, listen, really listen when she talks to you. Hear her out. Let her see you taking her seriously, however ridiculous you may think she sounds.
Take your time before responding with absolute no. If your instinct is no, say you are not liking her idea, explain why (worry about homework or safety etc) then ask her for her ideas on this. She may surprise you by coming up with a plan to get her schoolwork done or a safety plan.
It won’t happen overnight, especially when there is a pattern of distrust and disrespect, but it is absolutely possible.
Well done for reaching out to other parents. I am in touch with all my teens’ friends’ parents. We all check in with each other about whereabouts and we have been each other’s biggest supports when one child has been in a vulnerable place.