HEELP!!!!!!!!!!!!!!!!!?!?!?!?

okay ive been chillin with this gurl for about a week now and she had a boyfriend... two days after we first met she txts me sayin i wuz hot so we started to hang out more and now shes single bbut when i asked her out she says she dnt want a boyfriend rite now and its driving me insane cuz she is soo totally different frum the other girls ive dated shes very mysterious and i want her so how long shuld i wait to ask her out again and how shuld i do it????????? or is she jus leading me on and i shuld jus stop nd leave her alone???? (but still chill wit her and stuff lyke dat)