Fritz & Chesster / Fritz for Fun

Does anybody know the Fritz & Chesster games ? I would like to know how suitable they are for a little girl, and what's the difference between 1, 2 … 6. And how is the DS version, while we're at it.

Those sound like mainframe chess programs.

Chess teaching software for little children.

Never heard of it.

Fritz it one of the more famous Chess engines out there. I don't know if commercially sold Fritz packages contain material for learning chess however. I would instead use stuff like Chess Tempo website to practice tactics. If you want to try to learn positional aspects of Chess, there's a couple courses on Chess.com for that that have helped me greatly.