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Parents who stay together are taking an equal chance of stepping into a *mess* when they choose to have children.
When you marry a man who has minor children, he is a father first and a husband 2nd. If you can't handle that, don't marry into that situation. Yes, I know what I am talking about; I have 4 stepkids (all grown, now; hte eldest was 14 when we married). When people ask me how many kids I have the answer is always 6. My steps are as much my kids as my biological sons are.
I know that acquiring a ready-made family is very different than raising a child from birth. At different ages and stages kids are dramatically different; being involved in shaping a life from birth is in many ways easier than stepping in when the child is older and has already acquired habits and behaviors that are different than you would prefer.
You need fun and happy times together, but that doesn't mean you should be best friends with your stepdaughter. Maybe many years from now when she is fully grown and independent. But right now she needs a mother figure who will set the limits that her mother has not. The number of teenagers who lie and sneak around their biological mothers and tell them they hate them is far greater than you appear to realize. I think it was a Dear Abby or maybe Ann Landers column from back when I was a kid in the 60s or 70s that talked about a mom's perspective of hearing their child say they hate her--the correct realization is that it means you are setting the necessary boundaries, and she is unhappy about them--right in keeping with her age. A more mature kid would realize that the limits are because you love and care for them, and want the best, and want to avoid any chance of bad things happening to her--and that kid wouldn't say "I hate you." In general, daughters rebel more against their mothers, sons their fathers.
There are a lot of posts here with good advise. I do believe you need family counciling for all of you. At the very least, contact with the bio-mom needs to be dramatically limited; rules and expected behaviors and consequences need to be clearly set and understood by everyone.