L.S.
My daughter is onto her second week of the same thing, although it is much, much better. No mucous coming out of her nose any more, but she still has that yucky post nasal drip cough. Here is something one of my RN friends told me to do... it makes NOOOOOO sense to me why it does (I am an RN too), but I have tried it 3 times now and it works like a charm every time! My daughter even aked for "the socks" the other night!
Rub Vicks Vabor Rub into your daughters' feet, cover them with a pair of socks and put her to bed. That's it! I was told that she would sleep through the night without congestion or coughing, and she DID! Every time!
Good luck!