I then cast Kaya's Wrath, destroying Elenda and the zombie.
When the zombie dies, Elenda's ability goes on the stack, intending to giving her a +1/+1 counter. Since Elenda just died, normally this would do nothing (the ability can't find its target as it resolves).
But can I, as Elenda's controller, choose to resolve Kaya's Ghostform first, returning Elenda to the battlefield, then resolve her triggered ability, giving her the +1/+1 counter? Or is the Elenda that returns "different" from the Elenda whose ability was triggered?