I think she is talking about hastening death.
What she's saying is that sometimes, when a patient is dying, Morphine does both. The choice is for the patient to live 3-5 more days, in some level of pain, struggling to breathe, struggling with their disease, without Morphine, or 1-2 days if given Morphine and made comfortable. The Morphine takes them out of consciousness, and in turn, the body perhaps does not fight to live. I've seen this. I wanted to stop the Morphine long enough to have my mom know I was there with her, but I was told, and came to believe, that to bring her in to consciousness would be very painful for her. My wants were selfish, really.
If we're talking about a patient who is "struggling to breathe" at best, death is already inevitable.
Yes, that is exactly what I am saying, the morphine hastens the death by suppressing the autonomic nervous system.