Teenage girls can be challenging, and it is possible that your DD would have been the same with her own Father had he been there all the time rather than just popping in and out. My god daughter has grown into a delightful personable and fun young woman but as a teenager she gave her parents, especially her Father a terrible time and lots of sleepless nights. Her parents stood firm together, let her know she was loved but her behaviour was not. They spoke to her, but would stop the conversation if there was shouting or swearing. After many years of this, the family are still intact, the marriage stronger, and my god daughter adores her parents, especially her Father. They both acknowledge they are different people with different views on life, but have more in common than not, and most importantly love each other. The comments on here from some about a Step father not being a real Father were a bit unkind I think, some step fathers do a fantastic job. Talk to your husband, talk to your daughter, do not allow arguments, but allow discussion, there is a difference. Your daughter must not be allowed to break up your marriage if you are otherwise happy with your DH, this will only make her think that she is the centre of the universe and can get her own way, a bad start to her adult life. But most of all, most of us with daughters have been there, and honestly, this too will pass.