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My theory is that she remained sealed so she could actually have a normal school life (well, as normal as possible for youkai). Think about it- if Inner were out all the time, everyone would be afraid of her, and maybe keep trying to pick a fight to see if they could actually beat her anyways. Not something she exactly wanted...
and just to let you know, I have two sources who can read Japanese that confirmed the passage in question says she was sent to live with her mother (or at least went to live with her mother)
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