Mr. Moyer, who has earned $82 million as a pitcher despite modest physical gifts, has eight children, which I find heartening. Here's a question about heritability: do highly competent people like Moyer tend to have children who are above average in competence?
Women aren't competitive with men in sports other sedentary sports like shooting and equestrian. But, theoretically, there is a backdoor route to major league baseball for a pitcher without tremendous arm strength who masters the knuckleball. The knuckleball is an anomalous pitch that is sort of shot-putted up toward the plate without any spin. It gets buffeted about by random air currents and can be extremely frustrating for batters (or, it can be extremely easy to hit if it happens to fly straight and slow - knuckleballers need to develop a Zen attitudes to the slings and arrows of outrageous fortune).
But most knuckleballers, who are rare, started out as conventional hard-throwing prospects who switched to the knuckleball due to career setbacks (e.g., Jim Bouton in attempting his comeback in the book Ball Four). Almost no man has followed this hypothetical path of perfecting the knuckleball from youth onward to overcome sizable physical deficiencies.
But, I think she'd really need a father who was a professional pitcher, or a retired pitcher husband (think of ballplayer Ray Knight and golfer Nancy Lopez) to teach her to be a wily knuckleball or junkball pitcher. You have to really like baseball to be a junkball pitcher and not that many women like baseball enough. So, there are a whole bunch of hoops to jump through, but I wouldn't be shocked if a woman knuckleballer / junkballer pitched a few major league games in this century.