It didn't stick
The record shows a kill. It was reversed, so the ranking does not move.
It did not stick, and the victim was never on the scale to begin with. Outliving her own deaths is not a footnote to that entry; it is the substance of it, and this occasion ends in a change of host rather than an ending. Third place credits a share rather than a kill, which is the record being precise about an assault mounted on three fronts by two traditions at once. The standing order issued afterwards — find the weapon that would work next time — is the books conceding the point in advance. A reversed death measures what it costs to put something down, never whether it stayed down.
Luke Skywalker killed Abeloth in Fate of the Jedi: Apocalypse (2012).shownundone
she moved into Callista Ming instead
Mind-walks beyond shadows into the realm of the dead and comes back.
Vanquishes Abeloth in the Beyond Shadows, one of three simultaneous fronts against her.
Turns a Force storm back on Palpatine, with Leia lending her strength.
The farm boy is not the same character forty years of novels later. Battle mind-walking past death and back, a Force storm turned around on the man who cast it, and a share in the kill on Abeloth. The Legends version of this character kept accumulating for forty years; the canon one never got the chance.
Young Jedi across the galaxy are driven psychotic by a cause the Order cannot identify.
She originates as a mortal servant who drank from the Font of Power.
Putting her down at all takes Jedi and Sith attacking on three fronts at once.
A mortal who drank from the Font of Power and came back as something else. She hops bodies across the galaxy, pours madness into Jedi light-years away, and dies repeatedly without staying dead. Putting her down took Jedi and Sith hitting her on three fronts at once, and Luke still left a standing order to find the one weapon that could finish her if she came back.
One death in one work. It is the only place the record puts these two in the same room, and it is evidence about that meeting and nothing wider — not a general matchup, not a rematch, and not a ranking of its own. The ladder above it is argued from everything either of them has been shown doing; this page is argued from one citation. Where the two disagree, the disagreement is the point, and it stays visible rather than being resolved by whichever of them happens to be on this page.
Both entries carry their full receipts on the Star Wars ranking — 6 citations between them.