Wow! Your ex is still in. Going to the meetings and taking her daughter with her and THIS is how the loving congregation including the "oh so spiritual" Nana choose to treat the ones "related to them in the faith"?
Shouldn't they be doing the opposite? Love bombing them to help see how loving they are and that they have the truth?
They have opened the door to the way out and are adding a boot showing their true colours and what is worse they think that this is how God wants them to be.
I hope your ex has some nice "wordly" friends with children. I would throw my own party for her and invite ones that will be your friend regardless of what you or your parents believe.