Wheezy chicken

I went to let our girls out this morning and as they were running down the garden behind me I heard one of them wheezing and has more laboured breathing. Other than the wheeze she seems fine in herself, she ran down the garden straight into our kitchen as usual!

None of our other girls are showing any similar signs.

I've read some articles I have on common respiratory diseases and she doesn't seem to fit any of the descriptions of clinical signs as she doesn't have any discharge, facial swelling or sneezing.

Has anyone had anything similar? Is it likely to pass on its own or is it best to seek some antibiotics for her?