Doctors have already told her, "Do NOT get pregnant again. Your body cannot handle it."
I have compassion for you and your wife. This is a cross! I do not carry such a cross. My wife and I know a couple who uses NFP, had one child, then the wife developed cancer. She was advised by doctors that if she got pregnant again, she would probably not make it through the pregnancy. It is life and death as you say. She and her husband have continued to use NFP since that time (over 3 years ago). They volunteer at Pre-Canas at their church. She also sings at mass. NFP works.
But all of this can be avoided through direct sterilization.
Just so it is clear ... Sterilization is not 100% effective. It has a higher effectiveness than NFP or the Pill but it still is not 100%. There are only 3 options for 100% guarantee of non-pregnancy. 1. 100% Abstinence. 2. Castration (not just
vasectomy) & 3. Hysterectomy (not just
tubal ligation). I only know this because I teach NFP via CCL.
What do you do?
What I do, as you know full well, has nothing to do with your life or this issue. I can only behold the delicacy of life and love as you live it in your marriage. I can pray and will pray for you and your wife. I still highly recommend NFP, especially the Sympto-thermal method taught by CCL. My wife and I have been through a miscarriage. As you say, that is not fun at all.