I feel sorry for Tonya, she's gone from a crazy, pretty, winning party girl to a sad, broken down, pathetic woman. I think what happened on Inferno 2 with Rachel and Veronica really did a # on her, psychologically. She seems a lot more fragile than she used to be. You can even tell by the way she's freaking out here (if you notice, Veronica's sitting on the couch right next to them).
if you look at the season trailer, she slaps Veronica.