and why is it that step parents never seem to see their home as being a second home to for their step children but rather see them as some kind of inconvenience that need to be accommodated rather than welcomed into a home environment? surely children shouldn't have to 'ask' to be part of their NRP's home?
They NEVER see their home as a second home? Wow - how to make a sweeping assessment of every single step parent. As a step parent, I would like to state categorically that my step son is not an inconvenience - this is his home, and he is welcome here. All that I would ask (as my parents would ask of me), is that he let us know if he's going to come over at a time when we're not going to be available/aren't expecting him to be here so that we can ensure we have food and that his dad is around to see him. I have seen other threads where posters have tried to twist this into the fact that stepchildren aren't welcome - it's no such thing, but showing respect for others and ensuring you communicate what is going on.
This kind of thread is very sad - there seems to be assumption on mumsnet (not surprising, but still very sad) that every mother is a saint and every stepmother is an evil witch out to take the father out of their children's lives. Both mums and dads can behave appalling, and I don't understand why posters don't realise that, and why they don't feel that a step parent is entitled to have her feelings acknowledged, at least, rather than being told to, basically, suck it up and accept he has a child.
OP - it really sounds like you need to discuss this with your DP and work out how you can do things together as a couple. All parents need time away, and if you were her mum, people would be telling you you needed time for the two of you - one of the inequalities of being a step-parent, I'm afraid, is that you won't necessarily hear the same thing. Of course she's going to have traits of both parents, and I do think it's understandable that that is causing you stress at the moment, but it does seem you're misdirecting your feelings to her, rather than your DP. He is the one who should be ensuring that the arrangements work for both you and his daughter. I hope you're able to sort things out to suit all three of you.