Mayobrot quoted Authority by Jeff VanderMeer (Southern Reach, #2)
"In the second volume of the Southern Reach Trilogy, questions are answered, stakes are raised, …
Content warning spoilers: chapter 01
The answer, unexpected, surged up toward him like a kind of attack as the light met darkness: "Drowning. I was drowning."
— Authority by Jeff VanderMeer (Southern Reach, #2) (Page 26)
She felt like she was drowning when she came close to the Crawler didn't she? Maybe that's when she got cloned?
Also, the imagery used here seems to suggest that she is light and Control is shadow.