She's alright, and already out of the hospital. Apparently the group had been standing within 10 feet of the animal for about 20 minutes, which is advised against. This mostly serves as a reminder to not get really close to bison. They are huge and will mess you up. Here's another guy who challenged a bison at Yellowstone if you need more evidence to not mess with bison. Twitter responded with a lot of comments about how it's weird her parents just ran out of the way leaving her to get tossed.