I'm sorry that you lost her. 37 is a really young age, it must have been a huge shock.
As painful as it must be to have lost her, you probably don't wish you had ever known her. It sounds like she would have had the same medical issues whether you had met her or not, so at least you had some time together. If you hadn't come into her life, she might not have had someone that she loved by her side during her last moments.
If there's one thing that you could do for her now, it would probably be to try to make the most out of life that you can. I think that's what she would have wanted for you.