Well, there's only so much the Professor can do with mental illness. Usually he just deals with post-traumatic stress syndrome. Full blown dissociative identity disorder is a whole other beast. Most likely it will involve drugs that will dull the senses, making Aya apathetic and languid, preventing any sort of rapid mood swing. It's a complex balance of uppers, downers and anti-psychotics that can really mess with a person. It's a most unpleasant experience.
Then I'd imagine he'd use his telepathy to delve into the mind, helping Aya relive past traumatic experiences so that she might draw acceptance and closure from them. The apathy resulting from the drugs would likely help her distance herself from the emotions of the events and learn to accept what's happened without the emotional attachment.
In general.... this would NOT be very fun. No mental illness is. It's surprising how resilient- and fragile the human mind is.
Then I'd imagine he'd use his telepathy to delve into the mind, helping Aya relive past traumatic experiences so that she might draw acceptance and closure from them. The apathy resulting from the drugs would likely help her distance herself from the emotions of the events and learn to accept what's happened without the emotional attachment.
In general.... this would NOT be very fun. No mental illness is. It's surprising how resilient- and fragile the human mind is.