That started this am as I'm feeling rubbish and she didn't want to get dressed so it's a morning of her watching Peppa Pig butt naked
That may do her (and you) no harm whatsoever. It really doesn’t hurt then to win every now and again, my two know the difference between things I’ll negotiate on and things that I won’t.
Wearing clothes, wearing weather appropriate clothes is up for grabs, but their choice of clothes might limit what we can do that day (watching tv in pants is fine, but we can’t go to the beach for example).
I also think that the more you accept your child as a person in their own right with wants, wishes and views of their own the more you’ll come and go with them. My two are 7 and 9, and most days we’ll do a bit of planning for the day so there’s a mix of what needs to happen and what they have planned for the day. We also do things like plan meals together so everyone gets something they like at some point.
It might be worth starting to use visual timetables with her so she can see the shape of the day, maybe having things that she would like to do that she can put on the day plan. She still might not do it, but starting to involve her helps open up communication. We do a lot of now/next through the day too.
But mostly, if you don’t need to pick the battle, don’t.