Well I worked decades in hospital in Virginia, and that is how I and they think. I earned 2 pensions in the medical field. Claimed one early. You're getting extreme here. No exceptions does not really mean no exceptions and never has including for other issues. Like if a woman is bleeding out due to ruptured uterus, they will remove it along with the unborn child for example.
I have over 20 years in the medical field as an EMT. I am not getting extreme. No exceptions means no exceptions. If there is no stipulation/exception to save the mother's life, then people would be breaking the law. That is just how it is. If you were making exceptions to a law without that law specifically stating it, then you were breaking the law. There is no way around that.
As an EMT, I have to follow that DNR, if I made an exception because the daughter doesn't want her mom to die, I would be breaking the law and would lose my license. I use this particular example because it has happened to me a couple times. I was asked to save their life after being presented with the DNR. I had to tell them I am unable to do so. I was threatened with lawsuits. I stood my ground and because I didn't break the law and make an exception that the law itself didn't make, I was protected by that law.
That is how every medical professional I have ever worked with handled things. We followed the law, because in the end, the law protects us. So, I reiterate, no exceptions means no exceptions.