"Maybe you weren't sending her detailed reports, but -" Bella's not going to reveal that she knows she was being otherwise stared at - "you set out to meet me because someone else took an interest in me without - I assume? - having ever met me in person. It's not like Libby decided to introduce us because she's pals with us both and thought we'd get along. How are you characterizing her motives as anything other than spying, even if it happens that the only question she asked you is whether I died?"