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It sounds like a "hot spot" which is a localized area of moist pyoderma which means a superficial moist skin infection. It is very common. It looks green because of the bacteria infecting it.
In terms of over the counter medication for tonight you can give her human benadryl as long as she is not on any medications.
1 mg of benadryl per each pound of dog every 12 hours as needed.
Mix up some over the counter neosporin and hydrocortisone cream 50:50. Apply that to the affected area 2-3 times a day.
If Petsmart is still open where you live you can purchase an e-collar to prevent her from licking the spot.
I would try to get her into the vet tomorrow as it sounds like she needs a course of oral antibiotics. Does that make sense? Do you have any other questions for me?
You are welcome you can also try holding an ice pack over the area for 20 minutes each hour until bedtime. That can numb and soothe it a bit.