Possible worms?

[1234567chicks]

I've had chickens for over a year and have never dewormed them before. As of 2 days ago I noticed one of my hens was having diarrhea and all her bum feathers were wet from it. She is still eating but does have noticeably less energy. Most of her poops are pure water with the odd bit of food in it. She did have one poop however with some substance that I pulled apart checking for worms but didn't see anything? To add more info it has been very cold here the last few weeks dropping down to about-40 but this week it's been around -5. She hasn't laid an egg in about a month but I blamed that on the lack of light and that cold snap we just experienced. All my other hens are happy and healthy. If you have any thoughts I'd really appreciate your opinions
Thanks!
I'll include the poop pic

 

[1234567chicks]

I'd like to add as well her crop feels like a water Ballon. No solids in there just a whole bunch of liquids. Very different from my other hens

 

[Isaac 0]

Does her breath stink?.It could be Sour crop.

 

[1234567chicks]

I was thinking that could be a possibility as well. Last night I saw her eat some good but never checked her crop and this morning i checked her crop and it was completely empty. Also where she sleeps on the roost the ground was full of more just soaked shavings with a little bit of diarrhea. Also when I opened there coop up for the morning she goes straight to the water and drinks a ton and never went to eat

 

[1234567chicks]

Any ideas ? She's getting weaker

 

[Isaac 0]

@casportpony @Wyorp Rock

 

[1234567chicks]

I now have a silkie who is about 12 weeks old with paralyzed legs.. could I be dealing with mareks in my flock?

 

[Isaac 0]

Possibly.There are other diseases that cause Paralysis such as Botulism,Nutrition deficiency and Mareks.

Was she vaccinated for Mareks?