I wondered why they bothered spending time with the hologram of Kara's mother at all, if all she had to say was that she was not programmed with the needed information. In retrospect, upon learning about the actress's availability issues, perhaps it's a ham-fisted way of basically writing the hologram out of the show. Now that we've seen that the hologram doesn't know everything, maybe we won't be wondering so much why it isn't being consulted in the future?