Link to my cut of Rey vs the Serpent. Here she does not heal the serpent, instead it senses her dark power and retreats. Notice what happens to her hand: https://youtu.be/vMhEcoMmX28
EDITED POST:
And here’s a rough cut of Rey on Tatooine to show that the scene can work without any force ghosts:
https://youtu.be/2s11aO49bHM