Note that, while Alex envied Lacy’s relaxed, natural aptitude as a mother, Lacy envies Alex’s ability to move between multiple worlds. This frames Lacy as a grounded, instinctive person who has a clear sense of who she is, but who can feel self-conscious about not being smart, glamorous, or impressive enough. Alex, meanwhile, is much less sure of herself, but this lack of certainty also has upsides, as she can behave as a kind of chameleon.