Interference with R2 and F6

[DTQ_Blue]

What criteria do you guys use for ruling interference when a runner from second runs in front of the shortstop as a ground ball is approaching F6, assuming that there is no contact?

I have had plays where R2 was so close to F6 that F6 couldnt optimally position herself to field the ball, e.g. couldn't extend her arms or take an extra step in.

I've had plays where F6 can get into fielding position, but is visually screened by R2 for a split second as R2 passes by. Sometimes F6 cleanly fields the ball to boot.

Are these types of plays interference? Do you ever call interference if the ball is cleanly fielded even though the runner was right in front of F6 as the ball approached?

Do coaches tell their girls to run behing the shortstop in such situations.