I look at your sisters case and I am happyy for you that it worked out the way that it did.
When i am considering the case for euthanasia I am looking at people who are terminally ill. They may also be totally impaired and incapable of doing for themselves or thinking for themselves. this may be accompanied with pain or not.
The chances of recovering a normal life are nil. I am not sure that is the case with your sister. I am not sure she had a chance of fully recovering. If she did and for a time there would be pain that is different.
I do understand that the person may not be able to pull the plug on me in that event. I know that she will. She is my life partner and my proxy and my attorney all rolled into one. She also knows that I will not hesitate one second to do what she has asked of me.
I would rather walk into the end with my head up and my dignity in order then to suffer another month so my loved ones can watch me in torment while dying.