HELP! Silkie can't stand up!

[Kiki]

I am sorry for your loss.

State lab is the best option for the answer.
http://csu-cvmbs.colostate.edu/vdl/Pages/default.aspx

We can guess if you would like to answer some more questions but it would just be a wild guess.

 

[Wyorp Rock]

Sadly, just after I posted she died in my arms.

Sorry for your loss

 

[Chicks 'n ducks]

I am sorry for your loss.

State lab is the best option for the answer.
http://csu-cvmbs.colostate.edu/vdl/Pages/default.aspx

View attachment 1585764
We can guess if you would like to answer some more questions but it would just be a wild guess.

I don't think necropsy will be an option for me but I can give more details about her.
She was completely healthy last week, but on Monday I noticed she wasn't quite herself. not as active, withdrawn. On Wednesday I brought her into our garage and looked after her. I feed her a scrambled egg and some baked ground eggshells, as well as water with a little acv in it. She ate it eagerly. She was all hunched over, feathers fluffed. Checked for mites/lice, nothing. poop was normal. I also felt for a stuck egg, but nothing. Today I washed her and cleaned of her butt. There was a lot of poop stuck to it. She had lost a lot of weight and her breast bone was VERY pronounced. I dried her with a towel and stuck her under my brinsea ecoglow. Then, 30-60 minutes later, my mom noticed that she wasn't looking good. I went to look and she was flopped on her side, unable to get up. I carried her in to the house and sat with her next to a space heater. she was going fast. I used an eye dropper to try to get some water in her, but it was too late. she lost control of her head, closed her eyes, and it was over. Could it be Mareks? or something else?
Also her comb was grey (but she is a silkie). also her breathing was labored and with each breath there was a clicking noise.

 

[Wyorp Rock]

I just don't know sweetie