You can't block the plate like that anymore and your setting yourself up for an ankle and or knee injury from the looks of it.
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With the exception of NCAA, her position in the first picture is fine. Obstruction doesn't occur until the moment a runner's progress is impeded by a fielder without possession of the ball. In this pic, we don't have possession of the ball yet, but we also don't have the runner impeded. Where the runner might be in the future is not a consideration.
I agree 100% about being in a vulnerable position. That was the point of my previous comments.