Well, I would imagine that incredibly contrived stuff like this story or the Riddler's clues probably don't crop up very often, so I'm not sure it would be a terrible disadvantage in that sense. Although it does relegate her to being more of a fighter and relying on someone else to do research.
I would imagine even if she does find strategies to learn reading (which she seems motivated to do), she still wouldn't be on a level to deal with some of Riddler's more clever stuff that had people like Batman running in circles.