Nintendo Dsi XL Questions...

The DSi and DSi XL are exactly the same except the XL has a bigger screen and bigger hardware in general. The Lite plays old gameboy games as well as DS games but I doesn't have the camera, voice recording, music manipulator/player, or the drawing/animation program. Honestly, I don't think the Lite is a good buy unless you are wanting to play gameboy games. The XL screen is not much bigger and it is heavier. My daughter has the DSi and LOVES it! I even find myself playing it sometimes. :)

We have a DSi and a DSi XL, and for these 2 units the games are interchangeable. They are basically the same system, only one has a much larger screen. The XL also has a built in camera and other extras the i does not.

We have the DS lite and my son;s friend has the DSI. My son and his friend borrow each others games all the time.

The ds games work on the DSi XL...i bought one for my 2 kids a few months ago. It was an upgrade from their worn out ds'. Your DD will love the DSi XL! It has so many built in features/games, and web capabilities too...my kids can log in to their Webkinz accounts from their DSi's & play online. :)
BTW: My almost 7 year old son LOVES the camera capabilty! He'll take pictures of himself, and then 'warp' them with the built in warping feature. Way cool.

There are some games from the older system that do not work in the DSi. It's the bigger games. The ds lite has two slots, for two different types of games, while the DSi only has the slot for the newer games. I think it's gameboy games? I'm not sure, but they are larger and rectangular shaped. They don't have a slot for them in the DSi.