Originally Posted by chaos2x0

Midna is evil, and only helps Link because it is advantageous for herself. Ilia is definitely not evil. I mean come on, she was worried over Link pushing the horse too much. That would be one weird evil person.

edit: Well there is one way now that I think about it. Maybe the twilight would corrupt her and make her evil. I still think its not true but your theory is plausible under those conditions.