She's neither. Why do you assume she's being either on or the other? If YOU are interested in her then stop guessing and labelling and just ask her out for a piece of pizza or something one-on-one. If she says "no" then ignore her completely from now on except to be polite when she is. If she says "yes" well then, there you go.
Time to stop playing games and find out one way or the other.
Good luck, let us know what she says.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion