In some of the flashbacks it appears that at least the mother is in denial about how mentally incapacitated Suzanne really is, p.e. at her high school graduation. So perhaps she made Suzanne move in with her sister in order to make her "act more like an adult" and because of codependency the sister didn't really reveal how overwhelming it was to take care of Suzanne. It mirrors the mother's previous behavior when she makes Suzanne's sister take her to a sleepover in order to be a "normal child", completely ignoring the fact that if nobody her age is inviting her for sleepovers and she has to go with her sister which is many years younger she probably has severe developmental issues and needs some help.
That being said, Suzanne should have either continued living with her parents or been in some assisted living situation because she was obviously not fit to take care of herself and had no idea how to make friends.
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