I'm sorry for your loss! And I don't mean to trivialize what you're going thru, Matrioshka. I KNOW it must be very difficult to do everything u must do feeling the way u do, all by yourself! THAT must be the WORST PART!
However, it sounds like your mother passed quickly and painlessly! With little suffering or anguish! There's much to be said about going that way. Especially after watching my 97 y/o mother deteriate slowly but surely over the last number of years. She's been in and out of the hospital and back and forth to doctors COUNTLESS times. She requires 24 hour care and can't even go to the bathroom by herself anymore. Altho she's still with us, the mother I've known my entire life, and the grandmother my daughter's knew, has been gone for quite some time!