2 year old BR hen. We just found her in the backyard (she was fine this morning), laying on the ground, and gasping for air (each time she breathes, her entire body lifts up, then relaxes back down as she inhales). Comb and wattles are purple, she is not walking. We have her inside, please help. I added powdered garlic to their layer feed yesterday, as a natural dewormer and immune booster. Could this be the reason??? Please help, she is suffering badly!