Obstruction Oddity

[MD Longhorn]

ASA FP Rules, no modification. R1 on 2nd, no outs. Fly ball to left. Not going to be caught. R1 rounds third and plows (unintentional, but a solid collision) into F1 who is (I'm guessing) moving into position to backup 3rd base. Both umpires have OBS.

The runner cannot be put out between 3rd and home now. Heading forward, this is an easy score, we're awarding home.

Somehow, the ball is CAUGHT.

A) Runner returns and is tagged between 3rd and home on her way back (this was our actual situation).
B) Runner returns and is tagged between 2nd and 3rd on her way back.
C) Runner returns to 2nd, the ball gets away, she tries to score and is tagged out short of the plate.

Your ruling on all 3?

I'll tell you what we did after I hear some answers. The post mortem brought up sitches B and C - the umpire room was not in agreement on whether we did A right nor what the results of B or C would have been.