I understand your concern and you have reasons to worry about. And if you think you need to do just that, and your family agrees, then do it.
I would have done differently. It seems to me that 3 weeks is enough to understand whether your mother is ill or not. I wouldn't leave her alone for Christmas. Of course you have to be careful, but you can get infected anywhere.
But this is my opinion, and you can do as you wish
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