The only problem? She's got an iPhoto library almost as large as the iPad drive, and there's currently no way to store her iPhoto library remotely.
I'm looking at Space Monkey - but it's not clear yet just how it works or if it will be a truly seamless experience. (People like my parents can't be bothered to manually move photos around - it just needs to work.)
NB: In my research, I've noticed that 99% of iPad users think iCloud backs up all their photos on all devices, which of course it does not.