You should have seen her in H.S., she was awesome... Great player, even better teammate. My daughter was on JV team and Lea did everything... Too Bad two didn't get to play together. Concord High was/is loaded with ball players, there was a senior 1st baseman when she was sophomore. But we won...
All I made was a suggestion. The question was..."Question is how do you stop it???"... It work with our 12U team, and we pick off plays (for 1st and 3rd runners) which worked around half the time, our catcher had a very strong/accurate arm... Or, the catcher throws quickly to the pitcher staying...
Have the catcher throw the ball to first base right after the walk, and watch the other runner. No one ever went to second because the ball is at first, then she threw it to the pitcher