I'm going to be the realist here based on my recent experience in Hospice care...
I am not suprised that she went so fast. Not because it's natural to die so soon after stopping care, but because it's very normal for the victim and those closest to her to have already decided it was time to end it.
Assisted suicide is not the circus that Dr Kevorkian made it into. It happens quietly all the time. The patient decides that the constant PAIN and NAUSIA and all the other horrible, horrible, God-awful things that come when you're near the end and suffering from a horrible disease are just too much to bear and either they end it themselves or they have someone do it for them. Usually an overdose of pain meds.
"But what if you get caught?"
You don't. If you're registered with a hospice service it's very simple. The paitent dies. The loved ones who were there when the patient expired call hospice who sends a nurse over. That nurse confirms the death and records it as an 'attended death' on the certificate. Then the morturary takes away the body and carries out their wishes (burial, cremation, whatever...)
No police. No autopsy.
I've had this conversation. It will be forever burned into my memory.
I'm pretty sure this is what she chose to do. If this is the case I fully support her decision. Based on my experiences over the last few months and conversations I've had with other people who have had similar experiences... this is my conclusion.
May she find her peace.