All three of these options are very possible. I don’t think Flaca will go on a hunger strike, since that would double up on last season’s plot. In the preview, it seems as though Gloria is telling Sophia Burset that she’s causing a lot of trouble, but perhaps it’s actually Flaca. I don’t think it’s very plausible that she’ll jump Martiza, considering how close they are, but, hey, it could happen!
My guess: Flaca goes behind Gloria’s back.