As a shy geek, there is a tendency to be a bit klutzy. Through some accident, something happens that angers a more powerful being that decides to teach the young human a lesson. She is then cursed to become anything in body and mind of what is told to her, plus she will not be able to refuse any command. Though, as this is to teach a lesson, she won't be able to die either directly or indirectly from the curse, effectively becoming immortal because of it.