Sum of Parts 1

Trista has used her power to switch bodies with Nightengale, and as such has gained her psychic powers. Trista then seems to use these powers to dismantle her own body. Why would she do that to herself?

Actually, the colors didn't swap as much as I thought, and there's alot of WHITE in the pic. Clothes remain the same and even though Gardervoir is a pokemon, I'd still imagine those "parts" of her to be clothing.