It is a stunt and a stupid one at that.
A girl could be an extra point and short field goal kicker. They have nearly the same strength in their legs as boys but have less than 50% of the upper body strength.
She will never play in a game where there is any question of the outcome.
on average 70% leg strength, half upper body strength. the best have the O2 lung capacity of a 50 year old man.