Now, big disclaimer, I am very sceptical they would go there and they have been vague on if Bran can really change the past. Plus, Iam assuming Bran has not intentionally conspired to drive Dany insane early so that the realm turns on her. But, what else can you do.  So Bran was able to warg Hodor in the past and was able to speak to Young Ned at the Tower of Joy. These imply he can manipulate the past.  The way I see it there are two moments Bran could use such powers to prevent the m