BR collides with F3 after catch

[DTQ_Blue]

This happened in my game a couple weeks ago. NFHS rules in effect. Would like input on how you see this play.

Runner at 3rd, one out, fly ball to F3 who is in foul territory when
she catches the ball reaching over the orange base.

The ball is in the air long enough to allow the batter-runner to be
close enough to F3 at the time of th catch to collide with F3 just after
the catch, knocking F3 to the ground. The collision appeared to be
incidental and not intentional.

Though the runner at 3B would arguably not have attempted to advance, being very heads-up, she immediately broke for home from 3B when F3 was knocked over and easily scored.

Had the collision not occured the ball is arguably just returned to the
pitcher and no "play" would have occurred. But because of the
collision, the runner had an opportunity to advance and F3 could not recover quickly enough to make a play on runner.

Is this interference on the BR, and if so what NFHS rule would you apply?