Barred Rock Hen not laying, lethargic, puffy feathers

[Roostworthy]

Hello all,

I have a 2-3 year old barred rock hen who is not acting like herself. She is lethargic (often stands still) with a hunched posture, has diarrhea (couldn’t get pic but it was watery and light green), and has not been laying.

I checked her for mites and lice but I couldn’t see any. I will look again.

They are in the process of molting.

I have antibiotics and safeguard along with all the other vitamins and things in my chicken vet bag. I’m just not sure what to do and in what order. Should I worm her first and then give antibiotics after the worming cycle? Should I go straight to antibiotics?

Here are some pics.

Thank you for any information.

 

[Roostworthy]

ETA: she has a bad smell coming from her mouth and her crop is soft and squishy. I know for sour crop people withhold food but she’s already so skinny I hate to do it.