What movie was it in which a girl gets bit by a snake and the mother has to kill someone before sundown to save her?

it was from around 2015, there was a woman(witch, or shaman) living in a trailer in the dessert. She tells the mom that she has to kill somone, anyone before sundown to save her. There is this desert town nearby and she drives all day to try and find a victim but she has a hard time doing it.

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