Sasami didn't catch sight of Clarie's body as Uendo had stepped in to prevent her from seeing it. However, this place, these bodies...

"I don't want that power anymore. I'm sorry I ever wanted it..." she uttered, clinging to Uendo. She's afraid everything here is because she held onto the Calamity Knight "job". Is it? Who knows, but she's preemptively thinking it.