I am not a fan of this time of year b/c it seems to just stress out and depress a lot of people who are ill, alone, not happy, etc, etc. It is just hard to say "happy holidays" sometimes when your loved one is sick. I remember 5 years ago, my mom was diagnosed in Nov, and I was like "what do you mean HAPPY holiays???? My mom is fighting for her life. Bahumbug to one and all."
Your mom wants to try to keep thngs as normal for you as possible, and that means keeping on with the holiday tradition. I know it is hard. I wish I had words to help, but I don't. Just know that you are not alone.