Christmas feels weird to me -- It feels vaguely exclusive.
Her upbringing and class doesn't matter.
This is common: https://www.cnn.com/2015/04/02/us/chris-rock-pulled-over-pol...
Despite what social media and talk radio says, most Christians are fine others enjoying a non-Christian Christmas as long as it's being used in an uplifting way. Definitely no need to feel excluded.