Why would a girl I barely know, glare at me?

She might need gles, and be trying to see if you're that guy from cl. Find a mutual friend, and ask them if she's mad at you or anything. Or just talk to her about anything cl related- anything, like forget what chapter you were supposed to read and ask her next time she glares at you. I'd recommended doing it with a quick glare, and then a friendly smile, like you might not like her, but just want to talk to her about cl.Then see if she seems to not like you or what.