Okay... great!
...Meaning her health is good enough, or she would not lay these eggs...!
But giving her food during the nights could really help...!
Buy a
wall mounted feeder, such as the ones sold by
Omlet :
https://www.omlet.us/shop/chicken_keeping/feeders_and_drinkers/21348/eglu_cube_feeder_-_green/
(I am not saying you have to buy these ones
specifically : I am just using them as an
example of wall mounted feeders!!)
And then give her an unlimited access to her food... and to her drinking water!
(...Honestly, I don't think rats will come in the coop during the nights if they have not
already come during the days...
...nor do I think them
not currently coming during the days does mean they won't
eventually end up coming... even if you don't feed your ducks during the nights!!)
Huuuuh... is it chemical?
It "sounds" to be... and to be too strong for your girl...
But
what do I know?
(I actually really don't know about this product, so don't take me seriously here...)
Natural dewormers that won't weaken your ducks exist, so I really recommend you to use them next time.
(But you do what YOU want, of course!!)
No.
Keep it dry, so it can also act as a natural, non-agressive dewormer.
(In case she - still? - has worms or whatever... not that I think she actually
has them, but we never know...!)
Personally?
It actually depends on what I have on hand, but
I like using one or two food shovels -
I think the shovel sizes about 500 ml? - of food grade DE in a 2,7 liters feeder.
I use more than recommended, but it is not hurting my birds, AND is good for them (and for their eggs)...
(
Just so you know : since last year, I have had several Indian Runners coming to my home, being
much too thin... but I have been able to easily and quickly get them in a healthier and stronger shape
notably by mixing
food grade Diatomaceous Earth with their food!)
Looking at the pictures, your girl
at least doesn't look sad or weak...
She could be so thin because of genetic - chickens, and even people, can be like that too...
Still : I would monitor her, and feed her more of course - if possible!