Since in the end of the promo Clare screams ; STOP IT! I think it's cause her parents are fighting. And she wants be more free and her anger builds. Like Darcy i think she'll end up a bit crazy as you might remember her from season 7 and then look at her in season 10 she's changed alot. And i think she goes goth too make Eli want to have *** with her.(that is if she goes crazy)