An Aspie character of mine is very sensitive to ghosts. He gets bad, BAD migraines when they're close by. (Sucks for him, his workplace is haunted...) Maybe you could make her a 'ghost whisperer' or something? Able to summon the powers of the Underworld? I dunno.
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"My name is Sherlock Holmes. It is my business to know what other people don't know."