Seconded. I always seem to be initiating conversations (since I'm an E..) so I get self-conscious if I notice I've been doing it too often without the other person initiating in a while. I like to know that my friends want to talk to me, too.I sometimes don't talk to people first when I feel like I've been initiating too much. I figure if they're not initiating, then I've probably been irritating them.
She might also be busy, who knows. You could ask.
So you might just try initiating a little conversation with her.. just ask her what she's doing or something.