Hello. Thank you for your question. The type of cough you describe is most commonly caused by a virus, even in the absence of fever, which ultimately resolves on it s own. However, it can often be caused by seasonal allergy as well. In this case, if she is able to function and participate in her daily activities without a problem, you don t necessarily have to do anything. If she can t, however, you may want to consider a long acting anti-histamine medication. If so, I recommend consulting with your doctor so the appropriate treatment plan can be implemented.