Cinderealla's Royal Table of course!!! You know how beautiful and wonderful that would be! She would get to tell all her friends that she was proposed to in Cinderella's, CINDERELLA's Castle! I would be envious.
I mean, since you're proposing to her, make it one of the Disney Princess restaurants, or since you know her, some other movie or character from Disney she likes.
Get a 9:30pm reservation and you will get to watch the fireworks from inside the castle, and meet princesses and all that. We just ate there 11 days ago. It was magical. We got lucky and got a seat right next to the window.
They have a proposal package at the restaurant I think.
Here it is.
http://disneyparks.disney.go.com/bl...-royal-engagement-at-cinderellas-royal-table/