Kati Jo went to the ground to get the ball and the Colorado forward didn't really kick her, per se, but didn't stop running either. She more or less tried to step on Kati's face without making it look like it. So Kati got back up and pushed the girl and the ref had to come break it up, where Kati argued w/ him some. Then she turned away to throw the ball back into play and he stopped clock and carded her. I don't know if the card was for the push or the arguing, or maybe a culmination of the two.
Also, Christina Echavarry (sorry if it's spelled wrong) was carded too. She made a play off a header, but she probably did play the girl more than the ball. The girl went down injured, and Christina got carded for arguing with the ref for calling a foul. (At least, that's why in my opinion) Then the CU coach came on to the field yelling about how it was dirty and it should have been a red card and stuff.
More importantly, nobody was injured during the game, they were all able to pick themselves up.