Welcome to BYC. Does she have other symptoms of a possible respiratory disease, such as watery/foamy eyes, nasal drainage, sneezing, coughing, wheezing, or gasping? Does she have any white or pus material in the eyes? Has she been pecked around her eyes? If she is sick with a respiratory disease, she will infect the chicks, and they could have already been exposed. If she is sick, I would separate the chicks into a heated brooder. If she has been pecked, I would place her and the chicks in an extra large crate or pen close to food and water. Clean her eyes with saline, and apply some Terramycin eye ointment or plain Neosporin ointment to the eyes twice a day.