Help! Something is wrong with my chicken.?

We've had our chicks (now chickens) for about 3 months now and they've been doing great. I went in to check on them a few minutes ago and one of them is kind of craning it's neck sideways (almost parallel to the ground at times. She can walk around but wants to lay down. It's like she's looking at me with one eye because maybe something is wrong with the other eye. The other eye looks fine except it seems to be blinking a little more often than the other. I don't see anything in it and it's not oozing anything or red or swollen. Should I just wait and see what happens or is it something more serious? She's always been a little smaller than the other chickens, sometimes they overpower her a little and she has a hard time ever getting to roost since the rest of them kind of hog it. Any answers out there? I'm worried about her.