Traffic forecast in your area is looking pretty congested around 4p. LOL (Just my sarcastic passive aggressive side coming out).
Seriously, don't take any of her BS personally. If this becomes a pattern, then address it with a boundary.
Enjoy you time with your children. Smile at W during exchange time and tell her "Have a great evening!" and sincerely mean it. While driving over there, forgive her, forgive her, forgive her some more. Be as calm and happy as humanly possible. Project that to her. Believe me, that works the best.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712