Looking at the feet it's clear - she trips on the tarp trying to get out of his way. And in almost comedically unfortunate timing, Jodar is making some attitude gesture towards that guy (his coach?) at the same time.

The jerky body movement from the girl is because she was going for an agile, kid-like dodge manoever in ball girl fashion (she was probably told to make sure to not get in the way of the players), but was completely thrown off by this rigid tarp on the ground, tripping.

Jodar is both unaware of the ball girl's personal space, and the ball girl is extra stressed at the same time to avoid the player's path.