Banana thanks for explaining.
Last year I did a parenting course called Family Links Nurturing Course, which uses a book called The Parenting Puzzle.
theparentingpuzzle.co.uk/
I am just about to complete our parenting course for adoption (I am post panel but pre matching!).
The course last year was fabulous and the adoption parenting course usesd lots of the same stuff.
I know it will sound like a cliché (and I am not yet a parent to a child who has been adopted but I am mum to a pretty demanding 8 year old birth DD)....but can you in your dealing with DD take your time? I know with me and my dd it is often when we are rushing, when I need to do something like get her ready for school, church or an outing etc that she winds me up by taking ages! She lies on her bed and says she is getting ready when she is not etc etc. It is because I need to be there by a certain time and am stressed I end up shouting.
I hate me shouting! It is not who I want to be!
I am sure you feel the same. I hope you will find a way not to shout as it often (in my experience) escalates the situation rather than defusing it.
Could you just (when she starts shouting) go down to her level and tell her in a really soft voice what it is she needs to do and remind her once it is done, whatever it is, there will be enough time for... TV/play/a trip to the park/ a go on her bike/ some junk modelling with cereal boxes, some craft to make a little item of jewelery, some painting, sitting down to enjoy an apple cut up just the way she likes it/or a drink of ice cold orange juice/or a game of dollies or trucks or pets or whatever.... etc etc
Before you laugh heartily, no I do not do that all the time.
I forget. I shout. I often threaten rather than offer... Unless you get ready now there will be no TV after school etc etc.
I am really telling myself this is what I should do! 
You are, I am sure, right that she is recreating, or attempting to recreate, her previous family life. I am guessing for many children taken into the looked after system there may well be little of the good positive family you can offer with things like time together, trips to the park, rides on a bike, healthy meals and drinks, and fun games of dollies or trucks or whatever.
So you are showing her two new things, the things she will not get (shouting, chaos, frustration) and the things she will get (calm, peace, treats, normal healthy food and normal healthy play). I am sure eventually like most of us she will choose the good stuff and you will be much calmer.
I am sure you are doing a great job. 
At those times when you feel stressed, please do not allow her bevaviour to destroy your calm, not having to go anywhere too quickly and not having to do anything to too tight a schedule will make it easier. I know it is hard to get to school on time, we are late all the time! So I really am not an authority on anything at all, but I know what I aspire to, and wanted to share it.
All best wishes, Banana. 