Wait, what?
I've literally never heard of this, and it sounds absolutely insane to not watch the ball out of the pitcher's hand. In fact, you absolutely cannot get into a good ready position without timing the ball out of the hand. Is she just supposed to guess when the pitch is thrown?
Please... Unless you don't have any peripheral vision or aren't paying attention, it's not hard to know when the pitch is coming. For older age groups, the time from delivery to potential contact is often less than a second. The point is to not focus on the pitcher and then try to follow the pitch to the batter. At 3B, that is a sure way to not see the ball off the bat. Further, watching the batter will tell you much more about where the ball is going than looking at the pitcher.