My 2 year old golden sexlink hen has not been looking very good for the past couple weeks. I noticed 2 days ago that she is slightly opening and closing her beak repeatedly and there is little to no sound. Her chest and whole body is moving much more than it should while breathing. She is separated from the other chickens and has adequate food, water, electrolytes, dewormer and I have been putting VetRX on her head and under wings. Any ideas on what the problem could be or recommendations on what I should do? She’s eating but not drinking a lot as well. Thank You!