It would have been better if she stayed dead from a storyline point of view, then that way, Jack would always have some lingering memory of her. Then in some DOA moment for Jack, Carly's ghost would come back and cheer him on or something, making him even more of a cool character, but hey, it's a kids show, only the real bad guys die, and the misleaded or manipulated get revived.
I would have liked it better if they went that route with Jack, but having a revived Carly is good too. Yes, a revived Carly with no memories of the past arc is good too.
..........BLARGH, dead carly would have been a good plot device for Jack.
*sigh*