Liz Buchanan BVSc MRCVS
Hi - there is a huge part of the picture missing here - why did your cat need a CBC (complete blood count) and fluid in the first place? I mean, having sub cut fluids can be stressful or moderately uncomfortable and occasionally cats do behave differently afterwards. So it might be one possibility. However, it sounds as though your cat has some underlying illness going on, bad enough to need fluids - and if they have gone downhill, an assessment of this condition might well be in order. She sounds as though she might be in pain for example, so a chat through with the emergency vet is a good idea.