She does keep the ADAM levels balanced. Although Rapture is crap, it's economically stable crap. Everyone has ADAM, and people don't have to kill as much for it... until you come along. The Big Sister worked hard to stabalize Rapture, and she's not just going to let you come and mess it up. Everytime you kill a Big Daddy and take a Little Sister, it throughs the ADAM flow off, and that's why she attacks you.
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