She suggested it.
Mom was just diagnosed with dementia. For years she has missed birthday's, graduations, weddings, etc. It is just 4 of us for dinner. If she won't go, should I go with my daughter & son-in-law? I usually would not feel guilty, but it is Christmas Eve....
My son's girl friend has a college-age daughter with social anxiety. We often invite her to dinners and family events and we always tell her to do what she feels comfortable with that day. Sometimes she comes and sometimes she doesn't.
I hope you can give your mother the option to join you or stay home, right up to the last minute, and then go ahead with your plans with her or without her.
(Wouldn't social anxiety be a real bummer?)