I'm not so sure Rochette can win a medal of any color at TEB. She scored 158 in Canada, 5 points less than Elena Sokolova scored in Skate America, and 15-17 points less than two of her TEB opponents scored at CoC. And Joannie skated well at Skate Canada!
The problem is Joannie doesn't get much respect from the judges---they continue to give her lowish PCS scores (mid 6s). She has no cushion, so any small mistake could keep her off the podium.