My dd hated dresses, and in fact has sensory issues around socks, jeans etc. All her clothes were soft and silky!
She has continued to be a bit 'independent'.
I'd really pick your battles, praise the good, allow freedom of choice on clothes where you can, continue doing all the fab things you have done and are doing.
"She isn't toilet trained and I'm getting really worried about this as school approaches. I feel like it might be an attention thing."
Sometimes it is, so try and make toileting a really casual part of life but really praise when she does get it right, IMHO.
Is she three nearly four or only just three. My nephew was not toilet trained at three and my sister was worried but, as they say, they all seem to get it in the end.
"I've stood trying to make her walk for an hour while it rains around us and the baby cries." I think this does indicate a very strong willed child. I would have a stern consequence for that one, like no TV for a day or whatever.
My dd did that one, just stopped in the woods. A friend said leave her, she will follow, but I knew she would not. In the end we talked her round.
If you are worried, keep a note of these incidences. It really could be all normal and nothing of significance but also I think it could indicate she is a bit different. My dd is very different, I love her to bits, and we are still trying to help her realise her potential.
I think you will either look back and say that it was a phase or look back and say you knew she was challenging even then. Either way, find a way to parent that is positive, as much as possible, looks for and praises the good and shows her how much you love her.
Family links books and courses are really great. familylinks.org.uk/