You know what? I think you may be right. Even tough she's wrong, she's still my mother. I just hope her behavior towards her religion would change G-d willing.
I hope you understand that nobody suggests you should force your mother to keep the commandments. It is her choice but she should not stand in the way of your keeping them. You should make sure your food is kept in a way it will not be mixed with the non-kosher food she keeps. I know about problems when people who keep kosher live with non kosher people (I had a boarder living in my house for five years and he was not Jewish).
I wish you good luck (Mazel Tov) that things will remain civil. You should keep Shabbat as best you can, light the candles, and avoid doing any of the forbidden work... You must keep the Jewish spark alive in your family...