After going back and forth between idea 1 and idea 2, I've finally settled on option C out of left field...
Manasa, the protagonist, and her family are spirit guides (as in, they guide spirits to the afterlife, not that they're spirits who guide living people), and one day her mother and sister bring home some strange woman to live with them and train. Manasa doesn't like her at all, and it doesn't help matters that this stranger and her sister hit it off quickly, as all Manasa's life she and her sister were best friends in an "us against the world" way. And thus starts her descent into lonely bitterness that's at the heart of her emotional arc.
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Manasa, the protagonist, and her family are spirit guides (as in, they guide spirits to the afterlife, not that they're spirits who guide living people), and one day her mother and sister bring home some strange woman to live with them and train. Manasa doesn't like her at all, and it doesn't help matters that this stranger and her sister hit it off quickly, as all Manasa's life she and her sister were best friends in an "us against the world" way. And thus starts her descent into lonely bitterness that's at the heart of her emotional arc.