I'm going to try to keep this short. The main point I want to make is that we all, as parents, need to remember that we are our kids' PARENTS, not their FRIENDS. They have plenty of friends who will tell them what they want to hear and join them when they make bad choices. What our kids need is discipline, leadership, and expectations of right behavior. This is, of course, to be backed up by unconditional love. My kids are still young (almost 5 & 7) but I try to tell them every day that there is nothing they can do that will make me stop loving them, but when they make the wrong choices, they will suffer the consequences BECAUSE I love them and it is my job as their mother to teach them what is right.
Hard as it must have been, when we as kids would say something about wanting to move out of the house, my dad (who raised us) would tell us that we were more than welcome to move out. He wasn't being mean or nasty when he'd say this. He'd tell us that he provides us with a warm, loving home, food, clothing, and many other comforts, but if that doesn't make it worth following his rules, we should probably look for a place that is more suitable for us. He was not willing to change what was considered right and wrong to suit us, and because of that, we not only learned what was right and wrong, but how important it was to stick with our convictions.
There were times when I really did not like living at home. I didn't like having rules to follow. But I knew better than to break them. There was never a question as to whether or not my dad loved me...that was always clear. But so were his expectations of me.
Best of luck with your struggles. You daughter needs you to stick to your convictions, even if she doesn't WANT you too. Look to the Lord for strength. He gave your daughter to you for you to be responsible for, and He can give you the tools to properly fulfill that responsibility. God bless you and your daughter!