I don’t think anything changed other then the fact that she is ok being friends with you after divorce. By the time of BD WWs are detached because they have usually been detaching for years. Imagine if you were 100% detached. You wouldn’t mind having your W on a family vacation right? Instead of of jumping at the crumb you should have said “we are not a family anymore so there won’t be anymore family vacations”.
I know it’s easy to look for any signs but as is often said here “actions not words”. D papers are an action. Has she stopped them?