Sounds like the female has other resources for extra food. I'd stop putting food out completely. Even if the neighbors try to reign them in, cats gonna cat, especially if the cats are accustomed to roaming.
Cosette is definitely feeling better. She still stays under the couch, but she's much more receptive to attention, and she's more playful when she comes out. Thursday she goes for checkup. Getting plenty of food into her before the pouting on Thursday and Friday!
It seems that yesterday was the peak of her pain. She's in better spirits now. She's learning to grab bites of food. We got some gravy for her to lick from our fingers and she loves it. I thought she'd stay angry but she hasn't. She almost looks happy to see us.
No pills at home. The IV treatment last 48 hours. We'll see if she eats dinner. Right now I can't tell if she's in bad pain or she's mad. I'll ask for pain killers if she's not eating.