If the graphics jump backwards isn't an issue, get her an emulator and have her play the earlier FF games (6 comes highly recommended, and is the most story heavy of them).
Otherwise, it's difficult finding JRPG's on the PC, and the Western RPG game (Baldur's Gate, Mass Effect, Morrowind, etc) are often more complicated as far as stat management and behind-the-scenes things go.
If they're up for trying one though, Morrowind comes with my highest recommendations, and will run on anything considered decent nowadays.