When to sign a DNR

Yesterday Granny fell. Granny is my 85 year old grandmother. She has the beginnings of Alzheimer's disease, mild high blood pressure and stenosis of the neck. Relatively healthy for an 85 year old. She lives with my Aunt.

Part of Granny's personality is that she is very anxious. She has a strong belief in "Everything in its place". So while my Aunt maintains a beautiful home, my Granny thinks she needs to be constantly helping to clean up. A particular point of contention is the cats' litter boxes. Understand that one of Granny's anxieties is about the safety of the cats. She keeps them locked safely in her room, thus requiring that the litter boxes be in there. So, though my Aunt has told her a million times that she will clean the litter boxes, if Granny wakes before my Aunt, she will clean the litter boxes. That in and of itself is not the real problem. The real problem arises when Granny goes to take the litter out to the garbage. She opens her bedroom door, with bag in hand, failing to close the door behind her, thus allowing the cats to escape into the house. When Granny opens the door to the garage, the cats run out. Granny panics and runs out after them, without her cane, and in a panic. 

Yesterday morning my Aunt had a Dr. appointment at 9AM. My Aunt rarely leaves Granny alone, but it should have been a brief Dr. appointment and the dangerous cat litter routine had taken place. Unfortunately after my Aunt left the home, Granny claims that someone came and opened her door and the cats got out, into the house. No one else was in the home. She then opened the house door to the outside, I suppose to check and see if the cats had gotten outside. She walked out, down the stone steps and fell in the driveway. 

My Aunt returned home about 2 hours after leaving. Granny was in the driveway screaming for help, unable to walk or get up herself. She had broken her hip and cut her arm. We spent the day yesterday at the hospital. She'll have surgery today. The attending physician asked how we would want them to respond if she coded. We hadn't discussed it previously. Granny seems to have a decent quality of life still, but she does have some medical issues. I'm not sure if she has the ability to decide for herself what she would want. I only know that they can do a full code ( I think that's what the Dr called it) where all measures are to be taken and that's the default; or they can do a DNR (no measures to be taken if her heart stops). We went with the default, but it leaves me wondering this morning, if there's something in between. I guess that's a question we'll have to ask today.