That little dog treat may have undone all the hard work you've put into making her feel better with the slurry and the Clavamox...which is understandable, because I know first hand how hard it is to not give them treats.
The licking the floor and drinking as well as the hacking and swallowing could all be signs that her esophagus is irritated again. Unfortunately, there's not much you can do other than continue the treatment your vet prescribed for the original problem. However, if she seems to become more uncomfortable or seems to have more trouble swallowing, then you should consider getting her in to the emergency vet so they can give her another injection of Cerenia to help her feel better.
Hopefully she'll be feeling better by morning on her own.