If you are happy with your relationship and you want to marry her and you are not investigating on her, then I would say try not to talk to her. Wait for that special moment. And it will be a time to remember for you for your life. Thats a once in a life moment and will not come back. Its memorable if you wait for it most anxiously. Most will not agree, but thats my sincere advice just to make it memorable. Again see the iffs in the begining.