Hello! First time BYCK with 4 (roughly) 6 mo old Red/Brown sexlinks. I acquired them about a month ago and all but 1 is laying (not sure who isn't yet, but I have an idea.) All of the gals are free range in my Baltimore City backyard for about 5-8 hours a day; all eat/drink well. All but one girl, Erma, has had the comb growth and the dark red color appear. Her comb has grown very little and is about the same color as when she arrived a month ago (like a pinkish/ever so light orange color depending on the lighting.) I haven't noticed any worms in the droppings I pick up every other day from the coop or any droppings outside. I did notice today that she would intermittently open her mouth while walking around, but I don't think she's extending her neck at all - plus, it was 91 degrees today, I thought she may just be warm. A friend of mine advised getting ivermectin as a "cure all" but I'm not sure if I should try something else because I'm not positive what type of worm she may have or what else is available on the market - also, the closest feed/poultry place near me is about an hour away in either direction so I'd like to know what I should get and call ahead to be sure it's there. Please help, & thanks in advance!