I like what Truth said, saying it in a card or a note doesn't leave you as an up close and personal witness to her reaction...which is about her anyway. Or just pray for her and let God sort out the rest.
You're doing fine in your life today, Rose, and it's nice that you were able to have a civilized conversation with your ex. You don't have to get drawn into the chaos of people who are not in recovery, you have the right to say no.
Hugs