"I believe they may have been siblings."
Doubtful, because in the scene through the window he puts his arms around her and clearly has one or both hands on her boobs. Could be an incestuous relationship, I suppose, but I don't think they were related. She was just his dumb little moll who helped lure Chris in, then found that she had real feelings for him. When she saw Bone put the guns in the back of the car, she decided she didn't want to hang around for the violent mess that was likely to follow, and she bailed out.
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