But it doesn’t matter what she does, the same basic principles apply. If she makes a mess, she needs to clean it up, fix it.
She needs to be told, calmly and firmly that the behaviour is unacceptable and why. That she is capable of better behaviour and that you expect it of her.
If she is rude, or ignores you then the same principles apply, Mum is in charge, child is expected to do what she is asked first time.
E.g she ignores you when you ask her to come and put her shoes on. Ask nicely first time, ask more firmly second and then remove toys/switch off tv etc, pick her up, pick her up plonk her down and put her shoes on.
For the five year old hand her the shoes. And tell her to put them on now.
Reiterate that they are expected to do what they are told first time, thst ignoring Mummy is not acceptable.
You are have the authority, use it.
Never ever, threaten something you aren’t prepared to follow through. Eg if you hit your sister one more time we are leaving. And then leave if they do it again. No second chances.
Never, ever give in to tantrums. (A hug to calm a child down isnt giving in, sometimes they get overwhelmed by their own emotions)
Calm
Firm
Consistent
Its a marathon not a sprint.