You approached her cautiously, attempting to initiate conversation. Noticing you staring at her, Cindy didn't look up from her book and said

Look, I don’t know what you want from me, but I’m not interested in any of it. I don’t care if you think you’re entitled to a conversation just because you see someone being alone. Maybe try thinking before you talk to me, and think about whether I seem like I don’t want to be bothered. Go flirt with some other bimbo and leave me to my book.