When OBS turns into an Illegal Block in the Back

[robbie]

In my opinion, you were totally out of line in with "You can't do that, R1!." My take is you should not speak directly to the player especially in 12U (as we were instructed in Indiana NSA - yes, different, but....)
Given that you did address the player, you caused her advance to be delayed - "R1 rounds 2B, stops to look at me, then continues to 3B where she is caught in a rundown and tagged out in the confusion."
Figuratively you obstructed her further.
Were I the Offensive Coach, I certainly would be calling for an award of 3B and you would be hard pressed to deny that you were contributory.

That said, the eject or no eject is a totally separate issue. You just have to go with gut and circumstances. That said, I would have to be 100% sure it was with intentional malice or I would have simply a 12 year old's reaction.