First, she can go pro now whereas Lebron could not have unless he went to Europe. So she has more freedom in that regard than a basketball player.
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Yes, of course, she can go pro now but is that the best
thing for her as an athlete/person??? It's her and her
parent's decision; not yours, nor mine, nor that of the
overzealous fans like ...
Note: Tiger Woods turned pro at age 20. Played at
Stanford for a while. Should be good enough example for
Mary. But then again it's a free country.