I see no contact until the hair gets grabbed and the punches start. The aggressor simply tripped and seems to have had to find someone to blame. If I were her coach, she’d be off the team.
And I’d probably be out of a job.
I doubt that she simply tripped.
The black girl had received the ball, had turned upfield, and had an open lane down the sideline. The white girl was chasing and caught up. Looks like the white girl clipped the back of the black girl’s heel. Incidental contact, but still a foul. A penalty kick if it happens in the box.
The skill level of these girls doesn’t seem very high. Nothing wrong with that — I’m glad they’re playing a sport, whatever the level — but the lack of skills can make for a much rougher game. My daughter’s U-14 team (mostly 8th graders) is more polished.