Please, talk to your vet about two things:
1. As this may not be the correct antibiotic for Coco's infection, to do a culture and sensitivity test to find the correct antibiotic for the infection.
2. Many vets insist on a urinalysis one or two days after medication (antibiotic) is finished to make sure a bacterial infection is indeed gone. If your vet didn's suggest doing one, please talk to him/her about doing one.
One other thing comes to mind. Perhaps what you're seeing now is caused by inflammation. If that's the case, a short course of antiinflammatory medication can bring Coco much needed relief. (Sorry, I don't know what you're feeding, so I'd just like to add that if Coco is having all these problems, a diet change may be necessary to reduce the chance of more infections and inflammation.)
Sending best wishes and healing vibes for Coco.