The Near Witch by Victoria Schwab is really only an Honorable Mention as far as the GU archetype goes, but well worth reading.
Teenager Lexi lives in a small village named Near (in some undefined time that includes rifles but not cars or modern technology) that appears to be very closed off to outside influences. There’s a story in Near of a witch who lived long ago, who was accused of killing a child and murdered in retaliation. History has become indistinguishable from legend at this point, but Lexi begins to suspect the Near witch is real, and not gone after all, when children begin disappearing from the village.
Unfortunately, the locals fixate on the stranger who has recently showed up, an enigmatic boy that Lexi names Cole (because he won’t divulge his real name), and who becomes her companion as she tries to discover the truth behind the missing children, while protecting her own little sister Wren from joining them (and, eventually, protecting Cole from the villagers). She is helped (and sometimes hindered) along the way by two elderly sisters that were once powerful witches, and may still have some magic left in them. As time runs out she must find the old witch’s bones to put her to rest, which involves entering a haunted wood and battling the witch’s spirit and her crows. (A sort of secondary adversary is Lexi’s uncle, who is one of the village elders and leads the hunt for Cole, refusing to listen to Lexi’s protestations.)
Lexi does defeat the Near witch, and saves her sister, but only with Cole’s help. There is not much interaction with the adversary until the very end, and there’s no big journey or otherworldly exploration. She does have absent parents, though, in that her father is dead and her mother has sort of faded due to grief. And the adversary does try to trick her at the last moment.