Not every terminal patient can pass through the doors of death in a perfect state of "pain-free, calm and alert." (THOUGH A LOT CAN -- A LOT MORE THAN WE REALIZE.) But everyone can go at least in a state of "no consciousness of pain, no seizures."
Excellent palliative care is,I would say, a right (and ought to be much more available.) Suicide is not. It's just part of the general crime of homicide.
I don’t know what all she was taking at the end. I am quite sure the list included what you’re describing though..