Originally Posted by
GnaReffotsirk
Actually, I think she sees the worst possible outcome. I take it from this angle:
That she has been abused all her life, used, and discarded. This makes her so afraid of being discarded by the other races that she knows want the Zerg dead, herself included. And be used by the New overmind.
The being used by the new overmind though is obviously a lie, as the UED, having control of the Overmind, though with difficulty, was unable to get to her even a little.
This leads me to believe the Overmind created her as a free agent. Her affinity to the Overmind was not by choice at first, but as her DNA is changed, she takes on the vicious nature of the Zerg. So while she was a free agent, she was Zerg.
Aldaris spoke about her being fully infested and irredeemable. He seems right.
Her deceitful nature would come from the innate nature taken from her humanity, her murderous nature comes from the Zerg.
What I'm saying is that she couldn't have done otherwise. She's Zerg now, fully. But then at the end, she felt an emptiness. She felt tired. Maybe there is still a part of Sarrah that survives inside of Kerrigan.