in the final film while hanging from the cliff Kiara tries to help Zira up even after all she's done, but she eventually slips and falls, being conflicted over whether she would rather fall than survive as the latter would mean she would be siding with the pridelanders and betraying her loyalty to Scar.
However, in the original draft rather than not deciding before it was too late, after a few moments she outright decided that she would never side with the pridelanders saying "No.... Never" to Kiara in a low tone and determined manner, before purposely letting go of the ledge, effectively committing suicide. Supposedly the line and suicide act were cut and altered because some considered it to be "too dark", unfortunately. I felt the old version of her death would've far better suited her character considering everything else she does in the film, even shamelessly threatening to kill her own daughter (directly to her might I add) when she decides to side with the pridelanders near the end of the film.
A partially animated sketch still exists of this scene, accompanied by the score used for the stampede scene in the first film: