Welcome to the teen years!!!!
Is has NOTHING to do with you being 40 and 55 when she was born, NOTHING to do with her being an only, and EVERYTHING to do with normal teen hormones and attitude.
We all go through it in some form or another, some easier, some much worse.
We have an only daughter, 20, and I can say that we had mild teen issues and right now she is living in her own place going to college and things could not be better. I never imagined our relationship like it is now.. I only dreamed of it. Like I said, we did not have horrible issues with her personally during the teen years but we did go through a lot of drama. Things do get better.
My advice is to always let her know you love her and you are there for her unconditionally. Listen to her and communicate with her.. mostly listening to her vent. Even if you feel like you hate her right now which you really don't, do not give up on your relationship with her. She needs you more than anything right now... she just does not understand how to show it without coming across as needy to you.
If you feel like things are out of control, then please find a counselor for her to talk with so she can get through her feelings. If you don't have an open relationship as far as communication, she could be holding something in that she prefers not to talk to you about. Hence, the counselor is a God send.
There is nothing wrong with her or your family if you choose to go talk to a professional. Please go before it does drive a wedge between you and your hubby because it will do that if you are not on top of things.
The fact that you and your hubby are drawn apart right now is a huge indicator that you need to speak with a professional.
One priority we had from the time daughter was born was weekly date night. Even if it was just an hour, it was an hour that it was completely US and conversation was based on what we like to do, etc and steered away from parenting during date nights.
Best wishes to you and please find a counselor to guide you through this step of parenting and your relationship with your husband.
Wow, your name changed while I was typing my response.