I have given you my opinion once, I will do it only one more time, listen if you like, ignore it if you want.
You are rushing her, you can not force a person to marry you.
11 months is not a very long time, especially if you don't see each other every day.
Marriage is for the rest of your life, so why the hurry, if you are going to be together forever anyway then why rush to get what is technically only a piece of paper.
You being together for the next 50 years and married for 48 of them or married for 40 of them still means that you are together.
If she has been burned before, then she is being sensible by not rushing into marriage again, she may not want to make the same mistakes as last time and thus is choosing not to make a rash decision.
If you really seriously love her and want to be with her, then take time to listen to her opinions. If she says you are rushing her, then take time to think about it and see if you are rushing things.
Talking like adults is not the same as being desperate.
If you want to be with her, then write it down in a letter, explain why you want to spend the rest of your life with her, and how important she is to you. Tell her that you love her, and that she is the most important thing in your life.
Then, now this is the hard part, let her respond to that letter.
Let her tell you why she does not want to get married right now, she probably has some good reasons which you may not have heard before because you got so angry.
If you want to be with her, you need to make the effort to listen to what she wants and be patient.
However if marriage is more important to you than making the person happy, then go somewhere else because it is never going to last anyway.
The foundation for a good relationship is talking to each other and more importantly listening to each other.
Putting pressure on somebody and forcing them to do something to make you happy is not going to make for an easy relationship.
Chill, take a step back and realise that getting married is not the most important thing in the world compared to being with somebody that you love and that makes you happy.
If you don't want to be with her anymore, then walk away. Don't make a big fuss about it, don't threaten to kill her with your bare hands, be a mature adult, realise that this relationship is not going anywhere and walk away.
There are plenty of fish in the sea, I am sure you could catch another one.