sad...so sorry you are going through this..and yeah...the codie/caretaker is all there...as you know.
i am sending prayers and healing thoughts your way (not a reiki practitioner but trained in sending some healing energy--for you--and comfort for your mom).
don't know if it a good thing (sounded good on the share)--at least your mother knows. i was the one who did what you are doing for my Dad and ultimately it was good...he was the caretaker in our family and as the oldest...I was born and raised to it...but I will say that, however painful, being with my dad as he passed was a blessing...and I had some spiritual experiences that helped me then...and later...to know I was not alone.
God Bless (that is what I call my HP).