Argument from personal incredulity, as usual.

Even assuming that she didn't have a TV in her cell (and if the guards decided to keep her isolated from the general population, they might have given her one), you just have to pretend that she
never went out into the common area. Further, you're also assuming that she didn't just sit at a table by herself, or with her cellmate (I know at one point she was paired with another American who was incarcerated on drug charges, but I'm not sure when that happened) and watch TV. Finally, you're assuming that this jealousy manifested itself immediately. It very likely grew over time, especially as the police leaked all the lies about her to the media, and as the first trial progressed.