I don't know why she looked at Jessica like that right. But seriously I don't think she knows how to properly communicate with others, maybe she's faking again and she thinks that's how friends speak to each other. Her interactions with others are awkward to watch and its Demi that makes them awkward, she makes people uneasy or something. It's like she's the only person that matters in a conversation and if they don't say what she's anticipating they can tell very quickly that things will go to tit. Everyone is on eggshells around her, just normal chit chat can result in a scatching comment or a joke with a jag.
Uncomfortable to watch.