As Coach likes to say, "LEAD." Your actions should be "I thought it'd be fun to take the kids to the amusement park on Saturday. You're welcome to join us." If she pouts, bitches, moans, or whatever, YOU STILL GO, and you remain UPBEAT about it.
"What is best for my kids is best for me" Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712