This is all about a talent vs practice question. The reality is 99% of the girls playing, if they work hard enough, could play at some level of college. I would say that a fully matured girl who is 3.2 sec home to first could train for as many hours as humanly possible and never reach 2.7 sec. Her natural atheletic ability has a ceiling. Now take the same girl and teach her a skill, like hitting or fielding. She can absolutely work hard and achieve the same skill level as a top level player. But again, the natural ability ceiling will prevent certain things. For example, two players with the exact skill set playing shortstop. The better athelete will be quicker to the ball and cover more ground then the lesser athelete. They both could field exactly the same way, but the better athelete would simply get to more balls.