It's been stated that Lana is extremely determined to put a halt to Cia's plans and has a hostility toward her, so... with that plot point established, I don't think it's possible for Lana to be pre-corrupted Cia.
I kinda like her too. I don't mind her appearance so much, now that it's been revealed that "She has a strong sense of self, clearly states her desires, and a provocative and aggressive personality." (Translated from the magazine that was posted on the ZD home page) While I do feel like there's...