Had an interesting bug reported in the Discord. The player had a pre Summer update save, downloaded the update, deleted their old save, and started a new game. A shop variable from the pre summer version somehow carried over to the new save they started and prevented the Regular from spawning. This is a fix for anyone who experienced that. No need to restart your save or anything. Should automatically get her shop to spawn after talking to her on the beach.
Let me know if there are any issues, and take care,
Todd