I am in a similar situation. While I don’t believe in Kiruv per se, I figured that she should have some connection to her people.
For every holiday I give her a small token of the holiday and a brief explanation of the meaning behind the day, etc. I gave her Mishloach Manos on Purim, a silk flower arrangement and some cheese cake for Shavuos, etc. She is always very appreciative of my doing so.