Odd situation really. She's obviously shown some commitment to you (she did say yes, unless she went down on one knee in the worlds wussiest event after gay pride), and it sounds like she wants to be shown some back.
As trescodrucey says, I think she wanted to see some fight from you, make her think you really want HER.
Yea, booze is a funny one, it can bring out some uncharateristic shows from people, it is a drug afterall and she did sound like she'd had too much. For example, I'm fine on most things, but give me any wine and...
2 years, well, has this kind of thing happened before? I don't think it has. Though in what would be a finger up against "feminist relationship ****" I suggest you never let her forget it and use it to your advantage...