So she is the "eldest" child, right?
Well, all of a sudden her world changed and she is probably resenting a lot of things...that only a little girl can fathom. For example, there is now ANOTHER baby in the house.. this means MORE pressure for her.... to behave.
Next, she probably has TONS of "expectations" on her, that is maybe not things she can handle emotionally nor mentally.
Oldest children, are often expected of things, not which is in line with their capability. Or they are expected to be and act like an older child, and they are not. And they get frustrated.
Next, she does not know how to "cope" with her frustrations. She is only 5... so they don't have automatic ability for coping.
So then, punishments/scolding/time-outs/taking things away, even rewards do NOT work.... because they do NOT address her real problem. It only tries to address the "symptoms."
Expectations that are not age appropriate=frustrated child, because they cannot do what is expected=frustrated parent who then pressures child more=child irked & upset again because their feelings are not heard nor allowed nor validated and they are not getting what they need=a parent who just punishes child for any reason or feeling the child has without assisting the child to express or explain what is going on inside them.
Your daughter is 5 plus she is obviously lacking in something... to me, her acting up is just a symptom... and the punishments on her are just band-aids. It does not address the realness of what is going on in the child... or why or why not.
When my girl gets like that... it is generally because TOO much is happening or expected of her ... or because she just NEEDS me.... even if to just sit on my lap and not say anything. She needs comforting... and "bonding." Keep in mind that a child "bonds" with their parent in different ways... at different ages and age junctures. It does NOT only happen when they are babies. It needs to be continual and "resuscitated".... whenever you see your child getting this way.
Whenever I re-connect and re-bond with my Daughter, she always gets happier... and more compliant... and more pleasant... and more of everything wonderful.
Mostly, when my daughter acts up... it means that she feels "jilted" for some reason.... she does not do it just to be a pain in the butt. She does have a reason... and when I do listen well to her, with my heart... I can see her for the tender child she is and what she is having a hard time with.
ALSO, an oldest child tends to get scolded/punished MORE than the other siblings. And well, that makes ANY kid, just so irked and its not fair. AND things like screaming about what clothes to wear, is just a way for the child to "control" their own life... and not have EVERYTHING dictated to them. Is she perhaps just mega frustrated???? And so even something like dressing... just gets her so upset? And anyway, WHY can't she "choose" what she wants to wear? My daughter, when she was that age, COULD choose her own clothes to wear each day. NO biggie. She was old enough and in Kindergarten. So what if the outfit didn't match... that is part of growing up and learning.... and for the child to trust their own instincts and choices and self-expression.
All the best,
Susan