Didn't expect her to be a elf, probably a half elf and her father is human.
Or maybe the whole family is elves concealing themselves and she is berated for having terrible skills in things and it makes it too risky to use her for normal business, but something like child surveillance was fine.
I thought she was going to be a colorless like MC.
MC studied his magic and discovered the real power of it attributeless, that permits to manifest things unbound by the know elements, feels weird that only MC did but it could be be the game logic that left it that way to have some people being mistreated in the medieval fantasy setting, or in alternative for its power and rarity it was made so that colorless got killed or abandoned and their magic research burned.