Wylla's dad was not a very good person. Maybe that's why he's seen as a faceless monster in her subconscious. Wylla doesn't seem to be affected by his presence much, which suddenly transitions to a conversation with Noella (the only way Wylla knows of Allone).
There Wylla shares the story of how she had to bury her dad. Noella/Allone listens and maybe can't help but think of her/his own father.