Actions are what can change this situation. YOUR actions. I am fairly confident that she has heard a lot of words from you in the past that have not been followed up with the necessary actions. SHOW her you're serious.
It may be that this won't be enough, however. My counsellor last year pointed out something to me that always sticks in my mind. My ex and I got together for a reason. And at the core of that reason was that I was a rescuer and he "needed" rescuing. If that changed through either (or both) of us getting into recovery, then there would have to be strong alternative reasons for us to stay together. I did, he didn't and I left. But, you know, I'm OK. And you will be too if you stay sober and work a programme.