I think she did clear most of it on her own because there was some of the grossest stuff I've ever seen (and I'm a medic) coming out of her nose and throat before the vet got here. Took everything I had not to barf right along with her, especially when she coughed and some of the phlegm splattered all over the vet's face. Poor guy.
She's drinking fine, nothing coming out of her nose.
I swear, poor girl came here all the way from Ireland only to have a rotten life. I just found out her previous owner actually rode her in the conditions he's in now. Even when she was skinnier!