Scaley is skinny, pale, and her eyes are different colors.

[Exopoulterer]

My favorite chicken who actually approaches and melts when held and petted but something might be wrong.

This is Scaley who is at least 16 weeks old, maybe 18 weeks. I got her May 21st as an "Americana" pullet and she looked to be about 4 to 6 weeks at the time.

She seems to have excellent vision and can see bugs from quite a ways and go snatch them out of the air. Also grabs treats with pinpoint accuracy.

She is more active than the others that are close to her age and is constantly foraging and hunting in the run, even when the others are resting or sunbathing/dustbathing, she is usually foraging and hunting around.

She is also light as a feather and feels skinny. She also has no color to her tiny comb when all others were developing normally with pinkening combs. A whole pound lighter than "sisters" at least. The others I bought that day are around her age. One was in the same cage assuming "Americana", same size at the time, but is much bigger now and showing some sexual maturing and lacks the muffs and beard.

Another was sold as a "production red" at the same time but looked the same age. That one may lay any day now.

Here are her eyes: first 2 are natural light and second 2 are with the phone light shining on them. The pupils react to light.

 

[Exopoulterer]

Here she is next to Big Red. Big Red is comparable in size to all 3 "sisters". One younger one sold as "Whiting True Blue" was bought 5 days later and was smallest at that time may get bigger than all of them as she is growing like crazy. I haven't got their weights in a few weeks.because it was just too discouraging to see my sweet baby not growing and being scrawny but still so active.

 

[Wyorp Rock]

Some pullets grow at a different rate than others.

You report she's eating/drinking, active/foraging and it sounds like she's interacting with her flock really well.

I would not worry about her at this point. Depending on what her genetics consist of, she may always be a more slender built pullet/hen.

I don't see anything alarming about her eyes in the photos or anything else that would cause me concern at this time.