It was MOTHERS Day.
A little adjustment to your day could have made a world of difference, to your MOTHER.
Being home at 9 instead of 8:30.... ya, I would of done it. And your DH needing sleep... uhuh... But then my mother is gone. At this point, I would of let her do her bingo and been available whenever she was. BUT, like I said, my mother is gone. I have a lot of hindsight.
And I totally agree with the poster that said plan ahead. I'm sure your mother planned ahead for a lot of important things in your life. As well as "adjusted" her needs.
I do not at all blame her for being slighted. Seriously, think about it. OR, imagine YOUR daughter, all those years later, doing the same thing to you....

Sorry, it's a sore subject.