The map file for "Camp 1" shows that there's supposed to be a branch for talking to Sabrina, but I've never seen it appear. Indeed, in my Strider-only run, the game skipped straight to the next scene, even though Sabrina should have been an option.
(On the topic of the camp scene, Madeleine references Scarlet and Gavrielle in her branch, but it doesn't look like there's any handler for what happens if they died, or if Scarlet never joined in the first place. Scarlet also doesn't seem to have a default answer to Emma's question if Louise, Madeleine, and Meridian are all absent.)