[avyfain]

I used to tutor a 12 year old and a 9 year old in Python. Implementing games is a great way to go for a big project that they grasp well, just ask them for games she knows! Think about simple card games first, and if you really want to push her on OOP you can move on to complex things like implementing Monopoly or Battleship, or... you get the gist.

The only downside to this games approach is that unless you structure the process right, it might take a few sessions to get anything that feels even remotely like a game, and the kids can get bored.

Good luck!