No, it wasn't supposed to be in purple. Voting isn't considered something women should be doing in the first place in many Muslim sects, and the notion of rights and responsibilities outside of the home (other than maybe the mosque) is probably pretty alien to her. It's not terribly surprising that she doesn't know about her right to vote. Obviously, not all Muslim groups are so rigid, but since she clearly belongs to one that requires her to wear a niqab I'm guessing that her group isn't one of the more liberal ones.