If she tries to dismiss your arguments as silly, agree with her. It is silly to abstain from everything with a pagan origin.
Yep. Things with a pagan origin include the names of the calendar months and the days of the week. We recently found out that the name of the street I live on refers to a pagan version of heaven, should I move? In fact, a lot of the names of the streets around here refer to religious figures - Catholic saints in particular - so should I stop going to the shops on those streets due to the so-called false relgious connection??
You can get downright ridiculous with this one and end up driving yourself mad over it.
I would ask her what is - in her opinion - in the best interests of your family situation. The Bible also says to "Honour your father and your mother"; is asking her to enjoy a holiday meal with you such a horrible request that it deserves her dishonouring you and disrespecting your beliefs?? Maybe you can offer a kind of conciliatory gesture: if she wants you to respectfully attend (without being participants) any "special occasions" that JWs have (Memorial, Special Talks, Conventions), then you want her to respectfully attend your "special occasions" too. As long as she does not perform Acts of False Worship? in doing so, she isn't breaking any JW "rules".
Love, Scully (still dredging through old threads to find that article)