The graces pointed me up the gulch to the north, after first pointing to the encounter with what’s-her-name. They did not at any time point at the map fragment. It wasn’t big and glowing, it was quite tiny when I finally went back to investigate.
Maybe something they’ve changed with patches 🤷🏻
Also it’s “marked” on the unrevealed map, but unless you know what the mark means, it doesn’t look anything like a map.