Boy meets girl, boy likes girl, cant tell if girl likes boy back..?

So not too long ago i introduced myself to this girl via myspace.I know who she was before i introduced myself. We do the basic questions you ask when you meet someone. I like her, but i cant tell if she likes me. We stop talking for about 4 -6 days. Then all of a sudden she txt me at 2:00 morning! Soooo, what should i do? Do i keep talking to her or do i juz get straight to the point and ask her out?