If she likes me, why is she teasing me?

Anonymous
So I've been talking to this girl I like at work (She recently got dumped for another girl). We both recently found out that we like each other. The day she found out that I liked her, she was so ecstatic to see me, it was great! But when I ashed her to hang out with me, she said she was busy with other work-related matters. For some reason now (this past week), she doesn't always respond to my text messages. At work, it seems like that she doesn't talk to me as much, like it has gotten weird between us. This girl has yet to say no to me, and sometimes ignores my invites. Yesterday at work however, she started to tease me a little. It was in a way that she was busting my balls a little, I got sort of angry and frustrated at her. Is this just another way of her flirting with me? I'm so confused!
Updates
+1 y
She just sounds sarcastic with me like when she pushes me away from something she says in a sarcastic way "Do you think I care?" sporting a grin.
If she likes me, why is she teasing me?
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