Rather intelligent for a White Dragon, though mostly acquired wisdom and smarts through her long years as an Ancient Dragon. She's the sort of creature that doesn't accept her lot in life, or take no for an answer, and has a fierce, stubborn, independent streak. She will lie, deceive, trick, manipulate, and most importantly unleash her wrath until she gets what she wants. Slaying the Great Wyrm is considered her magnum opus, as it allowed all of dragon kind to share her freewill and independence whether they like it or not.
But she's still a White Dragon, and has a very primal way of thinking. As Geld's summoned ally, she'll be quick to offer CE solutions to all his problems - sometimes those solutions have a bit of finesse and sometimes they're just violent wrath.
Right now she doesn't accept death as her current lot in life, and she's reaching out to Geld as a way to 'live' beyond death. She needs him as a vessel to still be able to speak, act, and change the world, even if it means being Geld's servant. The centuries of her spirit being bound to her grave has made her desperate for any change or novelty.