I have one game that I have been playing under my primary xbox live profile, and my partner started another game. She hit Y to "change profiles" and selected add guest. After 4 hours of game play we shut the console down for the night. When she went to play again, the guest profile was not there, and using the "add guest" option added a new guest with the same name, but did not have her save game. How can she get her save game back?