Yes, what's her vaccination status?
Coccidiosis sounds like a possibility. If no improvement by Mon, I'd definitely talk to the vet. The trouble with cocci is the longer it goes on the more damage is done to the gut. If pneumonia, the antibiotics you've given should have made a big difference quickly (my dog gets it regularly, long story, and recovers in hours with pen and strep).
Get some pro-biotics (or live yoghurt) into her, keep the gut balanced with the antibiotics killing off the good bugs as well as the bad. Other than that I'd stick to water, electrolyte and hay for now.