I dunno, in the full speed, it looks unintentional, like she was getting up and stumbled, and the foot went down. But in slow speed it looks intentional.
I disagree, it looks fully intentional at full speed. There's no hint of a stumble, and there's no reason she should need to place her foot down there. She knows exactly where the other player is and chooses to stand / stomp on her.
The officials all agree, it was a definite red card for violent conduct.
If you don't watch it regularly you probably underestimate the body control and awareness the players have. A normal person might accidentally stumble and step on someone else getting up. But, players at that level don't really do that.