The sisters treated Mirabella like an outcast because
- she had a hard time adapting to normal life.
In the story, St. Lucy's Home for Girls Raised by Wolves, Mirabella was treated like an outcast by the sisters because she still maintained the mannerisms of a girl raised by wolves.
While others were making efforts to change, she made no progress. Claudette distanced herself from Mirabella but Mirabella later tried to cover her shame when she fell while dancing.
For instance, Claudette mentioned that Mirabella will be under the dinner table eating scraps when others ate properly. This behavior irritated Claudette.
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