Help! Sick Duck!

[Silvermist]

My Khaki Campbell hen usually lays an egg everyday, and rests maximum for 2 days. But she has missed 3 days and today she laid a soft shelled egg! She was very tired and unusually quiet the whole day and refused to eat or drink. Please help, what can I do?

 

[Silvermist]

[UPDATE] She has started to eat and function normally! However,she still did not lay any eggs. Could she have laid them somewhere not near the coop?