Raelin has always been a healthy dog, other than some minor stuff. For the past couple of days though is seems like she has a cold

Her nose is a little more wet than normal, and it is like she is trying to cough up something (like an old man hocking up a lugie

). She has been eating fine, her water intake is normal, and she has been acting normal in every other way.
About 30 min ago she started licking her lips frequently, and is now licking and drooling a little bit.

She has not thrown up, and I would let her out to eat some grass, but it is under about 6" of ice and snow.
Her stomach does not seem bloated or extended, and it is now 7pm and the vets are closed for the night. Any thoughts as to what to look for or what I can do to make her more comfortable?