She doesn't even probably have a good idea of what Christmas really is and what it involves.
Take her for a drive to look at bright lights. Let her open presents.These things likely won't mean Christmas to her since the only thing she knows about it is that it's something bad that Mommy doesn't like.
She might have been prejudiced against Santa, though. My parents called him Phony Baloney and we laughed at all the poor children who were lied to. You might not want to do the trip to sit on Santa's lap.