Oh gosh, I'm really sorry. I was thinking of you and hoping things would work out this time around.
If Coco absolutely has to have an antibiotic, please, talk to your vet about injections. I don't know of any other way to solve this truly terrible problem.
The injections bypass the stomach so you don't see any vomiting or loss of appetite. (We have to use injections whenever our Rosie needs an antibiotic, if we don't, we run into the same problem you're having with Coco.)