I pulled up the video. Potter is backchecking a Mankato player, reaching from behind, trying to poke the puck away. She more-or-less trips over the back, right leg of the Mankato plyer as the Mankato player cuts to her left. Potter slides from roughly the face-off dot into the post of the goal. She hits the post maybe on her right thigh, but more likely a direct hit on the lateral side of her knee. She skates off on her own, putting essentially the same amount of weight on both skates, and then steps from the ice onto the bench putting weight on first her left foot, then her right, and walks right down the entry way, back towards the locker room, etc.
Guessing at worst an MCL strain/tear, and maybe just a nasty bruise, etc.