I need the advice of the mumsnet court
My 14 year old DD came to me after school yesterday and asked me if she could go to a party Saturday evening. She is a bit of a hermit generally, mainly because most of her friends live about 30 minutes away so I was pleased that she had plans. Doing the responsible mum thing, I probed a little and she was very coy about the details. At first, it was at a house, and there would be no adults present (1st alarm bells), probed further, and she revealed that actually this party would be in the middle of a field, no adults just a very large group of 14 and 15 years olds. She also admitted there would probably be alcohol and drugs available. I told her in no uncertain terms that she would not be going and she went mental calling me boring and that she hated me and I was ruining her life.
She then walked out before I could stop her, and about 10 minutes later I got a text from her friends mum that my DD was at hers, she was safe and that she could sleep over night, although my DD came back a few hours later. She told me (No idea if she was lying) that her friends mum had said she disagreed with me and would let her go.
So AIBU. WWYU in this situation. She threatened to go anyway at which point I said that if she did, I would be removing all electrical items like tablet and x box and she would be grounded for months. I'm at a loss