Originally Posted by Chris Schempp
New PS3 user would probably be easiest, but you can maintain about 100 individual saves. You will eventually run out of saves for the game. Could be annoying to accidentally overwrite a save
Yeah, I would give her a user account of her own. That's nice for most games, where she can collect her own trophies and track her own high scores. You can friend each other too, and she can try to beat your high score in games like Zen Pinball and the like. A nice bonus of multiple user accounts, is when PSN went down and they gave every account holder those two free games, we were able to get all 5 across the multiple accounts we happened to have. I even created an Admin account that is the only one with my CC info and I don't have automatic sign-in for that one. The account I game with, as well as the kid's accounts are all sub-accounts of that one. That way nobody except me can add funds to the wallet, in case the children got over-exuberant about buying games (which wasn't a problem, but it just seemed like a good idea), or if the PS3 ever got stolen.
Anyway, a lot of benefits to having separate accounts. So far, all games, DLC and Online Passes I've ever gotten through purchasing or free codes have worked across all user accounts. I will be bummed out if that ever changes in the future.