I have had the same thing happen for the last 7.5 years. I really just think the ex likes to complain or ***** just to be a pain in the ****. I used to fight right back at her and explain what we did and the story she is writing about is not true. Now I don't even really defend myself. There is not a lot you can do. I do know how annoying it is though, hopefully one day soon she will back off and let you guys parent how you parent at your house without her interfering.