You have to do what is right for D and your conversation shows you are realizing you are talking to a 4 year old and reality sometimes gets mixed up with tidbits they hear on TV or adult conversations. Just do the right thing for her, which probably is her sleeping in a "big girl bed". You can't control what W does, just what you do. Maybe you should just drop the whole subject with W and let it blow over. I read in some of your posts that your W likes to drink. That may be part of the reason she comes up with all this stuff.