With these colors she looks more like a peasant who would know stuff about mysticism... And why not, it's just an interpretation of the character's background... And is unconsciously lore - dependant
Such color suit well to characters like Yukari, who is also an elf, the wood - huntress type, focusing more on efficiency and simplicity...
But for the fortune teller, I would have imagined colors that inspire fancyness, mystery and magic, like deep purple, dark blueish tones
Something that yells to the world "Yup, I know magic and can afford expensive clothes cuz i sell 3k G amulets that can save your imoutos"