My point is in more valid when you consider she dumped you. Proposing to someone who dumped you is more likely to be seen as pathetic that's why you don't see it around here.
The best gesture you can make is to give her the time and space to figure her $hit out. She has to choose to want to be with you for it to work out long term. Have you ever heard the term "rejection breeds obsession"?
How long have you made these supposed changes? It takes a really long time to make changes that last.
