Prayers for your mom and her family and friends.
It is so hard to know the right thing to do and what choices to make in these situations.....for the patient and the family. Chemo is never pretty and most people are aware of the side effects that happen....particularly at your mom's age as I'm sure she's had friends that have had it. It's tough to willingly subject yourself to it...doesn't mean that she won't do it....it's just very difficult to take that first step.
I understand how she would be reluctant to do it right before the holidays....especially as it's possible her doctor may not want her around children during treatment...as her immune system will be greatly compromised and children are little walking germ factories.
All you can do is be supportive, let her know how much you love her and need her in your lives.....and have faith that her doctor will guide her to make the best decisions for her.
<<<<hugs>>>> to you and yours...