Step daughter just moved in

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And I am feeling quite anxious and I am not sure why! She is a lovely girl when she is with us but a typical teenager with attitude at her mums house, always in trouble at school and hangs around with the wrong people.
This is mainly why she is moving in with us as we live in a different district with much much better schooling and we will offer her structure and stability here which she doesn't get at home but she was due to move in with us in a few weeks time but things came to a head last night which meant my dp had no choice but to bring her here.
We have a ds2.5 already and due a c section in a week and I was hoping to get some recovery time before she came but due to circumstances this isn't going to happen, my mum is coming to stay for a week and I am worried about space as we don't really have the room for everyone it I know I will need my mums help.

We are trying to sort a new school for dsd and will sort child benefit, is there anything else we need to be doing?

Does anyone have any advice on how to get a good routine going with so many people??

Not sure what else I want to ask really just needed to write it down somewhere I guess.

It obviously goes without saying I am happy for her to be here and I know she will do much better but I am scared

Thanks

Communication is of course key and we will take on board your comments re the annex.
Have you guys been in a similar situation with step children? Are you able to offer any advice in terms of routines boundaries etc with the annex aside?

I'd have loved to be in an annex, it would have been a terrible idea though. Is an extension not an option?

Cost wise no unfortunately not

I can't believe people are suggesting that OP and her DH sleep on a sofa bed. They will be in their bedroom with the baby in a cot. DSD is ok for now sharing with her DB. Obviously moving would be the best solution but it isn't that easy.

OP will be a new mother with a new born and their comfort has to be the priority right now.

A sofa bed in a few months - certainly not now with a CS and a newborn! But maybe once baby is five or six months and hopefully sleeping through enough not to disturb the two year old.

I suspect by then the dsd will have completely settled, and be behaving in a manner which makes it clear that being kept close to her df and dsm is essential....

Maybe DSD on a sofa bed then, but parents need their own bed and space. If the baby is like either on mine it won't sleep through till it's two.

Thanks unexpected - my ds only just started sleeping through at 2.2 so I am preparing myself for the worst!! Life is going to be hard and I fully understand that and we will d what we can to make dsd feel welcome and like this is her home, hence why I was asking for advice from those who had experienced similar