My son (2) will often get frustrated when he points to something I can't see - a sign we've driven past, or a book facing away from me - and I'm unable to acknowledge it. I can't apologize for myself in these moments, but I'm legitimately sorry for him; it hurts to be the sole inhabitant of your mind. Eve's fantasy is based on a residual sense that her mother sees what she sees, knows what she knows. It still hurts that her mom has her own life, and is indifferent to things she (for one reason or another) hasn't perceived.
The Pathmark line is a tip to a sort of magical power of older generations, this ability to keep doing things the same way forever, when reality has made those things impossible. It's hard to explain, and this was my attempt at the feeling, both comforting and endlessly unsettling: a muffin from a place that is gone.