If at first you don't succeed, go to Plan B. I'd been letting Cindy out first, shutting the gate behind her, then going back for Inga. Inga always made a break for it, pushing past me to go with Cindy. Sometimes I could catch her collar, sometimes not. Plan B in this case was to bring Inga out first, put her up on the stand in the headstall with her bowl of cereal, then go back and let Cindy out. Ta da!
I'd been feeding the cats on a counter top in the bathroom, which they consider "their" room. Celeste has been reluctant to join us in the rest of the house. Plan B was to move their feed bowl out to the kitchen. I see a lot more of Celeste now.
There should always be a Plan B.