NFHS obstruction/interference

[RKBUmp]

Had a JV game last night, almost a textbook example of case play 2-47-3b, except with a twist.

Runners on 1 and 2, ground ball right back to F1. F1 muffs the play and deflects the ball in the direction of F6, but slowed the ball enough that it only rolled about another 8' after first touch. F6 did not initially move to field the ball, she hesitated and seemed to be thinking about if she should field it or not. Runner has to choose a line to run in to get to 3rd since it is a force and after F6 initially doesnt move, chooses direct path to 3rd. As runner gets directly in front of F6, she now decides to try and field the ball and steps into the side of the runner.

I ruled obstruction on the play since F6 did not initially move to field the ball. The runner had to make a decision as to where to run. By not making a move I felt she had not made an attempt to field the ball until after the runner had moved in front of her. Conferred with partner later and he agreed with call. Opinions?