Sorry to hear about that mate, I think you need to store a backup of your save onto a flash drive. :Dthat's a good idea. Luckily the game is half cutscenes, which are skippable, so I've been able to make up about an hour and a half in like 30-40 minutes.
And before anyone badmouths the amount of cutscenes, they're largely animated by Studio Ghibli, so they're actually a selling point of the game.
Any reason she doesn't have her own profile on ps3?