Sudden excessive drooling without an obvious cause (such as a brand new addition to the household) is something to have the vet check out even if there aren't other indications such as the lack of appetite. It isn't usually a sign of a cold but can be a sign of other illness, pain, injury, nausea and things like that. Your vet will have a better idea of what may be going on after they are able to check her out and talk to you about everything. I hope she's feeling better soon.
