home run??

[shipwreck]

NFHS rules. Game using portable fence. Bases loaded 2 outs. The ball is hit to deep left field. Left fielder races back towards the fence and the ball goes off her glove and she crashes into the portable fence and is laying on the fence in the full down position. The ball lands on the fence while it is laying flat and then rolls back into the field of play. It either just rolled back in or when the fence came back to normal position, the fence pushed the ball back in, not sure which took place. We signaled home run. I think we ruled correctly but can't find this situation in the rulebook. It kind of threw us off because the center fielder picked up the ball and threw it into third base trying to retire the batter/runner. Can any one give me a rule reference on this? Thanks.

Dave