[TexBlue]

Not sure I have enough info here, but I'll give it a shot. If the runner deliberately ran into the pitcher with malicious force, I'm calling her out and ejecting her. If the force was mild and no malicious intent (in my opinion of course) let it go and play ball. I'm sure the coach will talk to the pitcher about where to stand. Since the pitcher didn't have the ball, you could call obstruction in Fed and ASA. However, the intent is what it all hinges on. If the runner meant to knock her down or back, it overrides the obstruction and she's out and gone.