I agree with mtnndeww, keep running and don't look back.

Don't fool yourself into thinking things will improve after marriage.
Each person carries alot of baggage from his/her life and if you think marriage is the answer your dead wrong.
When you start living together as man and wife, the problems with anger will only exacerbate. It sounds like it could be a control issue.
When someone keeps after someone about marriage etc., what ever it maybe, to me it usually means they need to control the situation at all cost. Is your own personal happiness worth this "great girl", who may not turn out to be so great after marriage. You actually find out who people really are after a marriage, the mask comes off and the real person suddenly appears. You think you know them, boy are most people surprised when there perfect person turns into somebody else.
People have this need to change the other person into the type of person they think would be right for them.
Marriage changes everything,
If you do go through with it, i would go with my gut instinct. Think very long and hard about this lifetime commitment.
All i can say is good luck in whatever it is you decide.

Ok, marriage may be the wrong thing right now. You say she's a 'great girl'...that doesn't really sound enough. But, why would you run for the hills?? Maybe she needs help with her problems? Why can't you stick around while she sorts them out...if she's willing. The only other thing is she does sound needy...if she's mentioning it every day. DOn't marry her yet, but don't run!!