@SummerDays2020
DD went to her childminder 4 days a week, we drove her to her and DH collected her by car.
She did gymnastics afterwards, swam at the weekend, we often went on walks.
When she got older she added riding and dance as well to it. She is slim, active and wearing a skirt until Y9 wasn't the issue.
You said girls aren't active because of her clothes. For me it's not the skirt or dress, it's the attitude of parents, choice of shoes and unfortunately teachers who often don't allow physical activities like climbing or running around at break anymore. And that attitude is taken over by children who repeat what they hear.
I wore trousers 80% of my school life, I hardly ever wear a skirt or a dress as an adult. I still don't like being active.
You can think that changing girls' clothing means they are more active, I very much doubt it.