When Sara removed Elgin's eye in S3 I thought she was so badass. But I also immediately knew her days were numbered.
In the S4 premiere, Sophia hinted at a Civil War of sorts among the townspeople.
I think it will start with Sara being suspicious of Sophia or even just Sophia seeing Sara as an easy target to "play" with.
I think Sophia will ingratiate herself with Acosta and manipulate Acosta and Elgin into telling everyone what Sara did to his eye.
From here we will see the townspeople fracture. One group (Boyd, Fatima, Donna etc) will fight for Sara. Acosta. Elgin, members of colony house etc will call for her death. With Sara's history of violence, this will split the other main characters down the middle and ultimately end with Sara being killed (I have about 50 theories about how that might go down. The possibilities are tragically endless).
I think Sara's death will permanently fracture the town into two hostile groups in continuous conflict thereafter.
Also, fuck Acosta and fuck Elgin. I can't stand either of them.