Abby,
I hope you come through Covid-19 as good as I did or better. I was stuck at home for the month of November. No Thanksgiving family get together. You know what? We still all chatted via video conferencing and had a great time. No passing viruses and food but everything else wss there.
Teresa,
You have had lots of suggestions, I would say if you are Teresa the rest of the time, stay Teresa. You will see your daughters another time but I personally would not stay alone for Christmas. I love seeing family and would clean extra well and see mom.
PS.
In our state Covid-19 is rampant and yesterday I went to a wedding (as a male with my wife) and celebrated with 200 other unmasked friends and family. Someone will get sick, we all understand the risks. I bet your mother does too. She chose to invite Teresa.