Whether in jest or anger, she would totally kick him in the butt. Not even on a rare basis. And it probably wouldn't matter what reason she had, Dan would still probably respond something like this. The loser.
"Tried to propose to my girlfriend today. I got her a custom lollipop that said "Marry Me?". She was supposed to see it, then see me on my knee. Instead, she just ate it and asked me why I was kneeling"