My ds started reading really early (around 2 - the same time he was learning his letters). He completely taught himself to sight read. How we found out (he would read signs, but we figured he just memorized common sign shapes and font) was that, as we were scrolling through Tv shows (while you're still watching a program), he began shouting out which shows he wanted to watch. Have fun figuring out what other words she knows! We loved Starfall (.com?) For ds.