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My 3 year old EE "honks" when it's very hot. Could hot temps cause what you suspect as "abit of chest congestion?" The sneezing could be environmental. Dust from their feed, especially if it's crumbles, can cause sneezing. Ammonia fumes from soiled bedding can cause sneezing. DE can cause sneezing, pollen, dirt/dust, smoke, pesticides on the lawn etc...
The tylan wouldve slowed or stopped the sneezing by now if it was a respiratory disease. Since there are no other symptoms, and if she's eating and drinking normally, I suspect it's an environmental issue.