My list:
-Breath of Death VII: The Beginning (XBLA, a parody of RPGs, also tribute ro classic RPGs, it's only 80 MSP, aka $1, and is INCREDIBLY simple )
-Pokemon Soul Silver( DS, and the Pokewalker encourages exercise!)
-Fable (XBOX, available for download off Xbox Live MArketplace)
-Super MArio RPG: LEgend of the 7 Stars ( Simple RPG featuring MArio! Wii Virtual Console and SNES)
- Paper Mario (Simple RPG featuring MArio! Wii Virtual Console and N64)
- Paper MArio: The Thousand Year Door ( Slightly more complex, yet still simple RPG featuring MArio! Gamecube)
- Final Fantasy Tactics Advance ( Really complex compared to these other games, but I think it's pretty simple in the long run. Just pick a race, earn a class (Many come free, but if you know what you're doing, you can do thigns to unlock more, leaving things for her to discover! Gameboy Advance. Might want to look into the DS sequel too, although I haven't played it, personally)
- Final Fantasy: Chrystal Chronicles (Only game in this series I've played is My Life as a King and the original. Both are fun and simple. The original is an action-RPG with simple character advancement and equipment making, MLaaK is a city-building RPG in which you create and manage a town while sending out Adventuring parties to earn money and dungeon delve. Original is on Gamecube, MLaaK is WiiWare)
-Final Fantasy IV ( great beginner RPG, with a good story of classic swords and sorcery, fun if a bit harder than the GBA or SNES incarnations. The full, "complete" version is on Gameboy Advance, with a full 3d Remake on DS. A much easier and dumbed down version is on Wii Virtual Console and SNES under "Final Fantasy II")
I don't think kids are idiots either, so don't be afraid to throw in something a bit more complex, like Fire Emblem (Gamecube, Wii, GBA)