young hen, pale comb, no eggs

[home on the range]

About 2 months ago one of our roosters was licked to death by our dog( more like held down to be licked and crush because of it). every since then one of my young hens like 6 months old has stopped laying. her comb has been fading to pink and in size. i also wormed the flocked and some seemed to picked up production, but not her. i know she didn't because she is the only hen that i have that lays dark brown eggs. help i need your thoughts!