Sneezing and congested hen what to do

[Gerryfixit]

over the last two days my NH red has sterted to sneez and sounds congested
seems to be eating and drinking layed an egg this AM what to do.
New to chicken keeping

 

[chickenzoo]

You can get a cattle medication from Tractor Supply Company called Tylan 50 . You can either inject it under the skin or squirt some down the throat. 1/4-1/2 cc for bantam, 1/2-1cc for standard grown chicken. Do this for 3 days.. Is their any bad smell about her face? Any watery eyes or swollen sinus?