She has black hair, blue eyes, and pale skin.  She arrives a few episodes after Kit gets released from the PIt and assigned to be a runner. When she arrives, Jackson remembers her and it's super weird because he doesn't trust her or Kit. She also has a big crush on Kit and it's obvious. She's the last greenie because the box stops coming back to bring more supplies and such. She's super jealous of Dal because Kit likes Dal more than her.  Eventually, she warms up to Dal and they become good friends and Sil develops feelings for Dal and Bev.