It would be nice if Sakura can be present to Rikudou's bed time story but I doubt it will happen. If the Rikudou left a bit of his chakra into the Bijjus so when the time is right he can appear and talk to the next "Rikudou" aka Naruto, then Sakura being present wouldn't make sense. Unless somehow Naruto brings her into the meeting or Sakura can just hear them without actually being present, like the moment between Obito and Naruto from 652-654.
Naruto could always explain to her when doubt is shown, like he could bring up that an old man from the past told him a story. Sakura will then understand that what Madara said is all true but missing the points. History is written by the victor. While it doesn't apply here that greatly, my point is that you never get a complete factual story without knowing the person in it, but even then, it's still not that possible.