It looks like she has been pecked. (I assume all birds are female until proven otherwise as I prefer hens). A water or saline dampened Q-tip gently gently wiped from middle of face towards the cheek, over the eye, will help remove debris and loosen sticky secretions that have it sealing shut. Washing the eye like this a couple time daily should be sufficient. Don't apply too much pressure, as that could grind debris into the eye, the idea is to get the moisture on the Q-tip to loosen the gunk (without drowning your chick.) Examine your chick carefully to determine if it's otherwise acting as if it is ill of health, as birds tend to be absolutely merciless with any flock member that's not in perfect health. It's suggested that one sick bird can cause the demise of an entire flock, and their attitude about the sickling seems to support the theory. I'm not suggesting that your chick was or is sick, it could have simply had its face too close to something the other wanted and *blammo* peck to the old eyeball.
