She must have known your stutter already as you talked to her many times in phone. It seems she doesn't care for it. Think urself as a hero and talk slowly. Impress her that you are a nice and kind person with a good skill to support a decent life. That's it. 95 % of girls will accept mild stutterers. I bet you this. Frankly speaking, there is no need to reveal it in first instance and you can tell her I face odd days when I'm more nervous and rest of the time when I'm relaxed and normal, I talk well.