1) I would not tell her she looks great. 2) Look good yourself and don't hang on to drag out chat. 3) If W wants to then OK, but need to be as if it is not so important to you and when handing kid over you should be on your way out to something fun. 4) Read the threads here esp what cadet has posted. 5) Post more of your story for people to give feedback.
All 5 of these points are great. Im no vet, but I would have said exactly the same things.
By telling her she looks great and dragging out conversations, all you are doing is looking needy to her. Unfortunately, thats not what she is looking for right now.
Tell us more of your story so we can give more detailed advice.