ADHD or ND she’s doing this because she can.
we’d all like to behave how the bf pick we want to be in control - it’s human nature.
ND is an extreme spectrum in either and of natural human emotion and behaviour. Our job is to help those who are ND to manage their emotion’s and communicate effectively to get their needs met.
OP you cannot just let your DD do as she wants. If at 7yo when she perfectly understands what she’s doing isn’t acceptable she doesn’t anyway what will she be doing at 17? At 27?
you don’t need to punish you need actions and consequence. You may also need to re phrase your instructions and answers.
“dinner is in 15 minutes and if you are still hungry after we can talk about snacks” (get a fridge lock if needs be)
“when you’ve taken off your school uniform we can/ you can ……” then no more engagement or argument. She can make the choice to do it and get what she wants of not.
she climbs on sofa and hurts her sister then you take all devices and controls out of the room, you all leave the room and have fun elsewhere. She can have the seat - but it will be no fun or point of she has no body to upset to do it.
after school meet her with snacks. Hold her hand - use a wrist strap if needed and simply ignore whatever she argues and just state “we are walking home safely”.
people with adhd need constant dopamine hits and it’s very likely your reaction is providing this whereas you have to teach her appropriate ways to get it. Look at sensory activities that make her feel calm. Do them together. Build the positive relationship back up.