Well, it could be the same mother or there could be some changes depending on the creative direction of the filmmakers. Maybe there are new elements introduced to add depth to the story.
I don't know who plays the mother. But you could try searching on entertainment news websites or asking on movie forums to get the answer you're looking for.
Well, in 'A Christmas Story Christmas', the mother is depicted as a caring and traditional figure who plays an important role in the family's Christmas celebration. Her character adds warmth and stability to the story.