Interference?

[Al]

A while back I was watching an 11/U game. Time had run out and the home team was to get their last at bat. They were down by a run but had managed to tie the game and had a chance to win it with girls on 1st and 2nd with two outs. The batter hits a low flying pop-up a little more than half-way to 1st base that was about 2 feet on the fair side of the line. The fielder charges in and gets her glove on the ball but the ball pops out and rolled just a couple of feet in front of the batter runner charging up the line. The fielder reached into the base path of the runner to try to get the ball but the ball ended up being kicked into the dugout by the batter runner. What is the correct call? Is this interference? Is this a two base award? It ended up with a heated argument by the DC when the PU said game over. What would you guys rule here? ..Al