My bantam brahma hen has some puffy looking eyes. It apears as though she cannot open wither of them all the way, as she should. Are there any reason that this could be happening? There is nothing coming from her eyes, they are just puffy eyelids, she is otherwise perfectly healthy and always ahs acsess to clean water and food, however other wild birds do coem around. Not sure if that has something to do with it. Thanks for your help!