As above really, I was a tomboy at that age and to be honest I think I may be mboys sister 😳
She’s 7, She may grow out of it, it may be that as she grows up she really does want a sex change but I think there’s plenty of time for her to decide that. Your job as dad is just to support and encourage her to be herself, happy and healthy and it sounds like you are doing that well so chill! She rides a bmx, I wasn’t that cool even if I was a Tom boy :
Ps at that age there is every chance that in a few weeks she won’t want to be a boy when she grows up, she’ll want to be a penguin or a lawyer….