curly I'm afraid you daughter would hate living here. My dd1 is yr10. Her bedtime is 10pm on a school night and 10.30 on a weekend. There is no way I would be letting her come in at 10! Where is she at this time?
I also have the rule that everything goes in my room at bedtime. Phone, tablet, iPod, laptop. And if she tries to hide that she still has it, everything gets taken off her for 24 hours (and I've only just relaxed this from a week)
I use to have to argue all the time a year ago, but then I just started to take it off her for backchat, screaming at me etc, and she has settled down a lot now, because she knows it won't work.
IMO, you are not making life easy for you or her. She doesn't know the groubdrulrs, you keep changing them, therefore she thinks if she argues/ negotiates, you will change them. Hence a battle ensures every time. If you stuck to your guns, in the long run she will stop arguing because their really will be no point.
I say, I will keep arguing with you dd, as it us good for your negotiation skills, but I am not changing my mind. She flounces off.
I kept her stuff for 2 months before Christmas as she bare faced lied over and over and wouldn't admit the truth. I doubt she'll do that again.
I do talk to her. Tell her my reasons, etc but I have to do that when she is calm.
Undermining your husband is not a good thing to do imo. And if I was you right now, I would sit down with him, write up some ground rules that you both agree on and present a united front. Life will not get any easier otherwise.
Hth. Good luck.