Big eye/swollen head going on...

Hey all! Wanted to get some internet expert opinions on what's goin on with one of our 9 week old hens...wife sent me these pics this morning of one of our hen's eyes bulged a bit...said she's acting normal and feathers are all laying fine; some sort of infection, conjunctivitis, swollen head? Gonna try to get her separated from the flock till we know more... Thanks in advance for any info!