Can you all tell from these pictures if my chicken is sick?

Lately I have been concerned about one of my Rhode island whites Olga, Her comb and or wattle seems too pale, While her sisters seems fine. The first picture is what they looked like last winter, On the left is Ester on the right Olga, the fallowing pictures I took today. This is my first couple years having chickens so I am not sure if this is normal or a sign that somthing is really wrong with her. I would really appreciate hearing from you folks out there who have a bundle of knowledge, on this topic.

She is young about 2, and she is the only bird in my flock showing any symptoms, Other than being pale, she seems normal, relaxing maybe more than her sister, but not lethargic by any means. There has been no stress, no change in environment or food (organic pellet) They have access to grit, They free range all day, have a nice dry well ventilated coop, no signs of lice or any other disease, they get yogurt and ACV. Is there anything else I should try? Any advise welcome.

Last Year
https://picasaweb.google.com/lh/photo/dzV5CQKO_TodYjlVfJ2VBNMTjNZETYmyPJy0liipFm0?feat=directlink

Pic One
https://picasaweb.google.com/lh/photo/rHxVGB1YrpKHQ0ujaskJqG6DIRtuPelOad8UZUrVUlE?feat=directlink


Pic Two
https://picasaweb.google.com/lh/photo/W9F5mTxkpK-HrWk0J5nmAG6DIRtuPelOad8UZUrVUlE?feat=directlink

Pic Three
https://picasaweb.google.com/lh/photo/SJWhosaKWJD5eLB7tqB_im6DIRtuPelOad8UZUrVUlE?feat=directlink