My ds is 11, only this year he's started going to and coming back from school, up till then I picked him up and dropped him off. Or to child minder/breakfast club when I was working full time.
He does swimming, now an hour but before it was only 30mins. He liked me watching him and encouraging him, your post seems to suggest you resent doing it?
I also used to take him to music and language lessons on Saturdays, but we've cut these back over time. It really was too much.
He plays rugby on Sundays, that really IS all weathers and for 2 solid frozen to the core hours, he loves it when I cheer him on, it helps him play better.
With her motor issues, your encouragement and support of her physical activities really will help.
One thing that made all things possible was FOOD! Mums of boys learn this really early on! On Brownies night, could you take a packed lunch/picnic type thing and at least she could have something to eat on the way home? It would give you more time to get her dressed and if she's anything like my son her mood will be more amenable too!