I've been there too Roberta.
Music helped hide the sound of the oxegen machine. MY loved one's favorite place was Hawaii, he loved the music. So that is what brought him a smile . That and a dab of orange oil on a moist cloth. Orange oil brings a smile. It's the Happy Oil.
It may feel she is delusional or nonresponsive, it's hard to know for sure. Holding hands and reminising about funny, happy memories will do you good and I belive your Mother too.
I am with you, sending courage, support and love.
eva