In the Ethernere Tainted West Karana (non-instanced): Lady Lendiniara is found in the pit in the northwestern part of the zone.
In the Ethernere Tainted West Karana (instanced): Part of the event "The Defense of Lendiniara" (see this quest entry for details about the group version and this quest entry for details about the raid version).
In The Void (H): Part of the Call of the Forsaken event "The Journey Home" (see this quest entry for details about the group version and this quest entry for details about the raid version).