Good grief! Football is a contact sport and girls are not built for that! Heck, most BOYS are not built for it. Just ask any coach in a small high school. That’s why they invented six-man football.
I attended a very small Air Force dependents' high school where every able-bodied male had the opportunity to "make" the football team. All I can say is that you've never lived until, at five-foot-nine and 104 pounds, you've been picked up bodily by a huge, 250-pound monster, launched into the air and landed on the ground with the monster on top of you, skidding along the grass to the extent that you've ended up with grass stains that have gone all the way through your practice pants and tattooed themselves on your naked buttocks.