I can't stand this..

Should a woman really get upset over small things that really aren't your fault?

As of late, things have been opposite of the old "99 problems, but a bitch ain't one" theory..  I've been having really horribly issues with my other half. I text my girlfriend a few days ago, and it was kinda early in the morning. Usually she answers quick but this time she didn't so I waited for about 3 hours and still nothing. I get upset and think she's ignoring me and ask her what the hell her problem is and tells me she was sleeping, called me a jerk, and got mad at me. She apparently at that moment questioned our relationship.. now, why is it that women get upset over this kind of thing? It's not like I knew she was asleep and I hate being ignored or when someone takes a really long time to answer. Usually that tells me your not interested in talking to me and I get pretty upset about those kind of things. Now she doesn't want me to come down and see her for a while over this small incident. I get really torn when a woman gets so much into her emotions that she can't think logically which I think is happening to her. I also think she might be losing interest for the fact she thinks I was being a douche to her. If someone has any advice leave a comment.