I have a 2yr old Americuana that quit laying three weeks ago. She used to have vibrant colors on her feathers now they seem bland and bleached out. Her comb seems ok, poo seems ok, and eyes ok. She has also started to isolate herself. Spends a lot of time on her perch. If I coax her out she will not mix with the other 4. When I give them mealworms she will eat and defend her ground. Any idea what may be wrong?