I have often wondered the same thing about a Boo. Thankfully we seem to be past the monsters phase and are back to Peppa pig. I can't get my dcs to watch any other films, although I keep trying them with nemo and shrek.
Son is currently obsessed with this film so we've watched it A LOT! As such I'm over thinking it all but was just wondering how old Boo is supposed to be? I find it hard to believe she can't talk in coherent sentences yet it toilet trained (as I said, totally over thinking things!)
Also can anyone recommend similar films so we don't all go mad?