I'm sure she was counting on the former.
The Ryner X Ferris pairing reminds me a lot of the Code Geass Lelouch X C.C. pairing. FukuJun's voice greatly emphasizes this impression too.
After seeing the last part of the Ryner rescue scene with Ferris comforting Ryner, I am definitely rooting for further development in their relationship.
Ferris was really bad ass being all calm (like she always is, though I'm not sure if it's all an act or if she naturally has nerves of steel) while facing Ryner in god mode. Ryner could have killed her at any time, considering he can cause giant explosions to happen anywhere at a whim. I also liked the fact that she actually read Ryner's research. While she acted like she didn't give a damn, she knew, and maybe even genuinely believed Ryner's goal and method. It really gave depth to her as a character.