If your DD is anything like mine, they tend to fill in the gaps with what they pick up by materials available to read, and in a lot of cases they just seem to know. At this point with my DD6 (We moved her from K to 1st in January and she just had her birthday) and DD4 they have their toys, but I also lay around activity books that range from grade level 1st to 5th. I want to give them the option to play or learn whatever suits them. For right now that seems to work for us.