Missing, Presumed Dead by Emma Berquist
The Dark Beneath the Ice by Amelinda Bérubé
Rules for Vanishing by Kate Alice Marshall
Shallow Graves by Kali Wallace
Now Entering Addamsville by Francesca Zappia
Bonus: If you’ve read Shadowshaper, definitely check out Ghost Girl in the Corner by Daniel José Older, which is a related Sapphic ghostly novella.