Hi B.,
Alot of times when step kids are involved, I think they sometimes have mixed feelings about, the stepmom that has come into the picture, and surely, once other kids (babies)start coming into the picture. Maybe she's feeling neglected, being that, there are more kids in the house and one on the way. Also, it's best that she always see your husband and you communicating on the same page, because, when that doesn't happen, children have a tendency to get excited about it and feel that they have control, rather than the adults having control. I have an eleven year old stepdaughter. When I married my husband she was six years old, and we went through all kinds of behavior problems with her, simply because, before me, my husband would let her have her way. But that's not the way my parents raised me, so, I was not having that from a child living under my roof. I have to say, we did use the spanking method, but also, my husband and I had to learn that we would come to an agreement with situations concerning her and not argue over her for things about her. Now, she's a much better child than a few years ago, but, we still have to get a little tough sometimes and let her know, we mean business, when we say something of importance to her.