I'm not a medical expert so I cannot comment that way, but I lost my younger brother to a massive brain aneurysm in August of 2012, and have family with medical backgrounds who went through painstaking detail in explaining to me how my brother's body was shutting itself down after brain death - despite being on life support.
Once the brain stops functioning and communicating with the rest of the body, it's only a matter of time before major organ failure sets in. Either way, death is imminent. It's just a question of time.
I certainly have sympathy for Jahi's family. I agree with you that it's a tragedy that they've dragged this out so long and tortured themselves. No one wants to lose their child -- especially after a surgical procedure that's so routine that it's literally inconceivable that someone would die because of it.
I think the honest issue is that it there are not endless supplies of breathing machines to help living people much less one who is dead.
I can see if it were used a bit to harvest organs for others, but beyond that it is hurting others who need the equipment to monopolize it for a dead person.
That is the other issue, the family does not want to accept she is dead and is that justification to monopolize equipment the living need.
I am sorry for your loss. Your words show an incredible ability to be both compassionate and accurate at the same time. Thank you for sharing with us