As others have said, wait for iOS 6.1.3 to release, update, and then give it your sis.
Although, if the evasi0n team finds a way to jailbreak 6.1.3 you're going to be out of luck (doubtful they'll want to burn the other previously mentioned exploit for a 6.x.x jailbreak)
Although, if the evasi0n team finds a way to jailbreak 6.1.3 you're going to be out of luck (doubtful they'll want to burn the other previously mentioned exploit for a 6.x.x jailbreak)