HELP! game was deleted from ps3! no idea how?!

So today my fiance told me she tried to play the walking dead and the entire game file was gone. When i go to the saved data utility it shows a file for the walking dead but the game is no longer there. What happened to the game?? Shes played through the game a hand full of times. She was in the middle of chapter three when this happened. Also another game went missing as well. Any help will be appreciated.

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