What should /can I do at home for my sneezing chicken with a runny nose?

My 2 month old white-topped, black polish chicken began sneezing yesterday evening. She was running around eating and playing and looked fine, but we isolated her just in case. (Yesterday, we swept out the barn and changed out the hay for fresh hay, so I know we had some dust kicked up - we do this weekly.) This morning, her nose was slightly runny, but she was still eating, drinking and . Her stool looked normal in color and consistency, and I saw no drainage from her eyes. She appears to be ok except for sneezing and runny nose. She is moving around with good balance, but it's hard to evaluate her activity since we have her in a smaller place while confined. We added several new chicks to our barn about1 month ago. Is there anything I can do for this chick at home and what are the warning signs I should look for that indicates something more serious? I would appreciate any help anyone can give me!!! Thanks!