Have you looked inside her mouth?
A good duck vet is best, and I understand not always possible.
Could she have been stung?
If she was stung, then a quarter-inch diameter blob of benadryl rubbed on the understide of her bill, where the swelling is, may be the best thing.
If she was poked by something in her mouth, then it is likely an infection, and she needs antibiotics. I would start with some antibiotic ointment (no painkiller) on the underside of her bill, and consider giving her an oral antibiotic as well.
You might also put a tablespoon of apple cider vinegar in a gallon of water for her to drink. ACV is mildly antiseptic.
I can't seem to get a good look at her this morning. Due to severe thunderstorms this morning I can only observe from a short distance. It dosent seem as swollen today but she does keep tucking her beak into her wing. I did the ACV yesterday and put out oyster shell. We do not have an Avian vet any where close to us. Is there anything you suggest that I could get from the feed store?