I have a few questions about this scenario.
Where is the father in all of this? Does he have any involvement?
What are your mom's rules about moving out?
Your sister needs rules and your mom needs to stand by them. If your sister doesn't want to follow your mom's rules, than she can move out, but if she's moving out, she's on her own. Now, the story is different if your mom kicked your sister out.
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In the Absence of Information People Make Things Up.
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