First, by my own experience. I did not leave my bed, my room. You probably said to her already that you know you messed up, that you are willing to work hard to make the marriage work. That you made mistakes and regret them.
Right at the moment, she could say that she would like to work things out. But instead, she is playing games with you.
IMO, it is a hard situation, but you need to let go the fear of losing her. This fear that she will go and never come back is letting you paralyzed, trying to please her whatever she asks.
As a woman, and maybe yours is not exactly the way I am. But I think she may be testing you as a man, as a guy that she wants besides her to be strong, decisive, the protector.
It would be great if you can post here some more details about her life in the past. Did she had "dad" problems? It's not unusual that we may be looking in a husband what we did not have in a father figure.
What you are doing about the Marathon is great, and maybe she is paying attention and there is a glimpse of hope that you may be indeed the person she wants to spend the rest of her life with.
These things may all be playing together and you may need to give us more info so we will try to advise you better.
Maybe what she is looking for is you to stand up for yourself and give her some boundaries of how much is too much for her to be pushing you around and hurting you.
Please, think about and let us know what it could be. And again, please write more often, write more to explain who are you and who she is. How did the dynamics got you both to this point?