This passage is intended to be a little unsettling. By asking Klara to imitate Josie, the Mother seems to be preparing for a future in which Josie is gone. It makes sense that the Mother would be thinking about this, given how Morgan’s Falls is tied to her memories of her dead daughter. It is unclear how well Klara understands what’s going on here, since Klara doesn’t reveal everything she knows to the reader, though Klara can clearly tell that the Mother’s behavior is unusual.