Think she's on her way out

Mrs pepperpot my pekin and my favourite isn't well. She's been pale for a few weeks and I don't think she's laid for ages either. I moved them all to the eglu on grass and wormed them 2 week ago while I took apart their run, disinfected their shed ( although no evidence of redmite) disinfected and dusted everything. Moved them all back but she's still been pale although was eating she's really thin. She's still interested in food, her crop seemed full and normal just now (I think anyway) I gave her some porridge but she's eating slowly, lying down while eating and moving slowly today. I gave her a bath as sometimes the mud sticks to her feet and there was some but I don't think that's the issue. There's no sign of lice. I could bring her in but as the ducks are in overnight and I have a toddler, im not sure if it'll stress her out more? Any ideas anyone please? 

Roberta was about 5 when she died, she didn't move around much and had chicks as well. Phylis is still going who is the same age, but not sure if she is laying.

Its sometimes all you can do for them 

Thankyou