In particular i was thinking something along the lines of paraplegic maybe a severe muscle disorder if proffered. Originaly she was concepted as a pure "enchanter." type character. She could etiher use a scarf or a staff to get around, though in concept she used a scarf that acted as a familar for her.The direct term for what she does is auramancy, but she uses it on a mostly physical level. She could be younger then the rest if you like. Her specialties would be summoning,and enhancing others/objects. Personality of a nerd. is is especially cool because the character could be really young, and because of the odd nature of the world not having much magic. She could be actually experimenting at her age, and it wouldn't all be textbook stuff. though there would be a general guide.

To give you a rough feel off how i think enchanting should work it is the use of magic to make something have it's own magical proprities. Something like a primative magic capability of it's own per say. 

If it's against your game I can make another character.