She killed the mother in the end too, we just don't see the shot. I think she let the mother live at first to lull her boyfriend into security so they don't think she is the cold blooded killer that she is. They wouldn't understand.
Yeah today it doesn't make sense. But back then she probably never could have gotten away, she was probably trapped in that life. No child support services or friends, utterly isolated in a hick town and around you a wild and dangerous country.
Imagine you grow up getting sexually abused since before age 11 and imagine the kind of atmosphere it would be to grow up in. A constant fear and repression of talking anything even approaching the topic. The religious spells of epic hypocritical proportions her mother would espout that even forced them to stop eating - while starving... In a life like that you probably would never experience any joy whatsoever except maybe if you manage to sneak off for a little while. But she was trapped. With all of them. Try imagining a life like that.
And her sister was a real mean bitch that was screwed up too. It's likely it went far beyond normal sibling rivalry. Like torture.
That scene where she sticks her fingers in her mouth and makes her throw up? It seemed weird at first but remember they were starving and resorting to eat "cackle berries" (whatever that is). The sister didn't just punch her she stole the food our of her mouth. Expertly done too! She would go hungry for the rest of the day now. Her sister was fine letting her starve.
It's really weird that I'm defending this murderous bloody killing spree lol. But the story does make a lot of sense really, now that I think about it.
PS: Also think about the scene before when the were learning to shoot - her sister insulted her and then she aimed the gun at her. It was a clear warning. But her older sister didn't back down, immediately after that you see her piling on.
TLDR: With family like that, you'd really prefer being orphaned.
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