Green Cheeked Conure - Feather Plucking

After last seasons Green Cheeked Conure not producing any young my Green Cheeked Conure female lost a number of feathers on her chest. Although she did recover to some degree she never really got all her feathers back.

This season she has shown interest in nesting but she has now lost all her feathers on her chest. Not sure if its a plucking thing or age related issue but she is spending a lot of time in the nesting box and has yet to lay any eggs.

I'm at a loss of what to do with her.

She took some time to produce her first clutch for me of four chicks and then three chicks for two more seasons after that. I'm not sure how old she is but I've had the pair for at least seven years.