I believe there is a part of Disney that helps with these specific ideas. Maybe you could have dinner at Cinderella's Royal Table, then head out for Wishes, arrange that Pooh comes up to you during wishes, maybe carrying a honey pot, snap a pic with Pooh and the two of you. Have the ring in the honey pot, (obviously no real honey here!), Say something adorable, like "I have enjoyed this journey for the past fifteen years, but we are only part way through the hundred acre wood, will you continue this journey with me"......etc. Then make sure there is a photographer there to catch the expressions and all. Just an idea......if you contact Disney Fairytale Weddings they can probably direct you to someone that can help you arrange this.
www.disneyweddings.com
She will LOVE it regardless of the specifics!! Congratulations on all your happiness and good luck!! Keep that magic going!