Mike Tucker’s BBC books, set before the NAs, used the Gale surname because he had forgotten that the NAs established McShane. Then he covered it by, as you say, killing off the TV/BBC Books Ace in Loving the Alien and replacing her with a parallel counterpart surnamed McShane. On the other hand, Mark Michalowski’s BBC novel Relative Dementias just called her Dorothy Gale McShane, and a few months later one of the BF audios did the same.