As we gather from her conversation with the Chorus, Electra has been waiting for Orestes for some time now. She anticipates both his arrival and the eventual revenge they can take on Clytemnestra.
We find that, perhaps unexpectedly, Electra doesn't lend itself to these traditional plot breakdowns. The play skips right over this stage.
There's no hope in sight for Electra as she is continuously frustrated by those around her (as we see by her arguments with her sister and her mother).
This is pretty much the worst news possible for Electra. She faces the prospect of a bleak future while she prepares to avenge her father solo.
It's easy to see that there's plenty of death in our death stage. But Booker's plot is supposed to revolve around the hero. The destruction/death stage is supposed to refer to the destruction or death of the hero, but Electra lives at the play's end. What gives? Again, we have to go back to the play's moral theme. One perspective is that Electra's death/destruction is a moral one; by being party to her own mother's murder, she becomes as guilty as the murdered woman.