I can't see this being interference in ANY scenario. Either the contact is malicious, and she's out and ejected, or the contact is incidental, and the fault of the fielder - OBS, award home. ANY non-malicious contact here, whether the ball is coming or not, is OBS, not INT. You can't call her out for INT for not sliding, as may have been intimated above.
As to the line I draw, I believe "I know it when I see it" is appropriate, but generally I'm looking for intent from the runner. "Avoidable" contact is not necessarily malicious.
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"Many baseball fans look upon an umpire as a sort of necessary evil to the luxury of baseball, like the odor that follows an automobile." - Hall of Fame Pitcher Christy Mathewson
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