Well the lumps in the jowel might possibly indicate strangles. If the snot is starting to turn green, I would say yes, she has strangles, in which case she absolutely needs to be quarantined from your other horses and all her "things" sterilized.
That includes you changing your boots when you enter the area where your other horses are.
Vets don't agree as to whether or not a strangles horse should get penicillan.
IF she really does have strangles, this article may help you How to treat strangles | Improve Your Riding | Your Horse
On the other hand, she could also just have a wahzoo summer allergy and her glands are swollen to go along with the runny eyes and snotty nose.
If there is anyway to afford a vet visit, this would be a time when it should be done because you don't know if you're dealing with a serious disease or summer allergies. The treatments and cautionary procedures are nowhere near the same.
Hope this helps some