Yes I am so sorry too. Like I shared, it's so hard to know. We are not God and we have no way of knowing when the situation is dire. But luckily it's not our job either. Don't be hard on yourself. You are a caring daughter or you wouldn't have even written in here. We understand, like I said two of my siblings didn't believe when my Mom was dying because of the life she led and the conclusions she taught us to believe from experience.
It is all over now but you will be surprised how relieved you may feel. People still ask me now that's it's been a year and how I feel. I finally told one in law that it's very different when someone dies that put you through hell. Sometimes I miss her and sometimes I am very glad it's all over.
What ever you do or don't feel please don't beat yourself up over this. You are only human and can't know everything. God Bless.