hmm,
I'm not pro at this, so don't put all your faith in me.
I think she's GENERALLY interested in you, however you talk to her like you would talk to your sister or cousin. Try to be more assertive, and try to be more daring in your conversations. DO NOT INSULT HER, but yet do not compliment her. Say things like,
"so I like the pants you wore yesterday, I actually think they're getting trendy and I think you look cute in them

"
or ask her something intellectual, like "so, my friend and I were having this debate. Free will or determinism?"
Try to get her mind to work, try to get her emotional and give her very slight hints that you're interested in her.
When you talk to her, try initiating body contact, not in a creepy way, put your hand on her shoulder, or if you're sitting next to her, place it on her knee. If she lets you, eventually hold her hand, if she holds it back, squeeze it, or rub her fingers, see if she reacts possibly, if all goes well, then go for it dude

she's into you.