Did you take her to an avian vet (one that is trained to specialize in birds)? If not, I would definitely find one because they know what to look for. In any event, if she is still acting congested or listless, I would take her back ASAP. When a bird gets sick, it can go from minor to critical so very quickly that I never mess around and wait to see if it gets better, I head for the vet the same day I notice a problem.