She's a Speckled Sussex. Her appetite is excellent. She drinks a LOT (is excessive thirst an indicator of an issue?). She's active-I even saw he fly about 10 feet in the run yesterday. She got about 4 feet off the ground. She's with two 13 week old Welsummers. They have 55 sq feet of run, shade, lots of ventilation in their coop. She's not losing feathers. Her weight seems good. They've been dewormed with Valbazen. I give them grower feed, Rooster Booster vitamin/eletrolyte/probiotic in their water daily. They did have chick grit, but changed to poultry grit last week. The sussex is notably smaller than the Wellies. Should I also offer chick grit? They get corn-sicles (frozen corn & water) and mealworms as treats. It's been over 100 degrees lately, so I put a fan on facing the run to help them stay cool. The only indicator I have is that when the other 2 are wandering around the coop - the Wellies are super active - she'll stand, neck shortened and close her eyes. Sometimes even when she's drinking water, she'll stop, do the whole "shorten the neck, close the eyes" thing. They have a dust bath of sand and DE mix and she is totally indulgent with that. She loves it. I have two other hens in a coop/run beside them. They're pushing 5 yrs old and free range most of the day. They're both super healthy & active. They've been dewormed too. I've looked at all their legs and scales seem fine. No runny eyes, no coughing, no dirty vents. Am I being overly worried here? Any thoughts?