Interference?

[DTQ_Blue]

R2 and R3. Batter hits bouncing ball toward F6. R2 runs right in front of her as ball approaches, but doesn't physically touch F6. As R2 clears F6, ball is in mid bounce about chest high and slightly to the left of F6. F6 had arms below waist and quickly tries to raise arms to field the ball, but the ball is past her before she can react. The way I saw it is that F6 lost visual contact with the ball when R2 was in front of her, and then when R2 cleared her, and she re-established visual, it was too late for her to react to the ball and field it.

I did call interference.

Next question,

How do you concisely explain this call to R2 when she asks, what did I do wrong?