Sadly, that doesn't mean it can't be traced to a specific event. It only means that if there was one, she can't remember it. So that path is no good for now.
Does she, by any chance, have an exceptionally acute sense of smell? (How is she with neutral or pleasant odors?)
Are any of her other senses hyper-sensitive?
How are you with trance work? This might be your simplest route.
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