The switchover to discovering the queen was rather too quick. That's not in the novella, anyways, and really seems to be backing away from a point (the question of whether the Xenocide was necessary and correct, despite being horrific) which gives the story depth. I always thought that was (politely euphemistically) not very courageous -- "oh wait, I don't really mean Xenocide; see here, a queen survived."
I don't know about the novella, but it certainly is in the novel. Historically, Card didn't actually start by writing Ender's Game. He started on Speaker for the Dead, and realized he needed to tell the previous story about Ender first. And,
finding the Queen