Hey, might want to let her play Toontown Online. It's very kid-friendly, and quite easy to get into. Having played it before myself many years back, considering it's a kids' game, it's actually quite fun. If you're afraid of colourful commentary, there's a chat filter too I think. Not sure how good a job the moderators perform with regards to player abuse though, but I've yet to see crude behaviour from other players.
There's also Fusionfall, which is an MMO spanning content across various Cartoon Network cartoons, including Ben 10, Dexter's Lab and more. Never played this one before, but reviews say it's good.
Lastly, when all else fails, Club Penguin is not bad too.
Post edited October 27, 2010 by lowyhong