I haven't found any instances of switching pronouns, can you point me where this happens? I've re-read it and I think I only refer to her as "The Ghost" and "She", and ghost is a unisex word.
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No problem! You're using female personal pronouns but male possessive pronouns for the ghost. "She" indicates the ghost is female, however, whenever you mention the ghost's brother, you say "his brother", the "his" there seems to indicate that the ghost is male. If the ghost is female, it should be "her brother".