Egg broke inside my girl

Does anyone know anything about this? I took my girl Coco to the vet today and he told me there was nothing more I could do for her. The egg has broken in her entire body. She has been swelled up for about a week now. She's eating and drinking normally but she walks like a penguin. The vet tried draining some fluid but it was getting so thick, it was clogging the tube and it had a bad odor. This was the only procedure he did to Coco other than examine her internally.
I'm not saying the vet is wrong, I just want to try anything I can to save Coco!!!! He suggested me having her put down. Obviously that is not what I want to do! He said she will just go down hill and never be able to return to her coop again. Coco is about 4yrs old. I know chickens don't have a long life span but I'm afraid to have her put to rest.

 

Thank you for replying to my post. Sadly, Coco passed away that next morning. I sent her to the animal lab near me to have her tested to make sure she wasn't contagious (even bough I knew it was a broken egg) and the results came back today. Not the news I wanted to hear. Coco had a CUP of yolk and fluid free in her entire body. I almost fell to the floor in tears when I read that! That is like 5 eggs! So she was egg bound for quite awhile and I just can't believe I didn't notice until recently. She only started getting sick a few weeks ago and swelling a week ago. I thought maybe she was just done laying eggs since she is 5yrs old.
The vet did tell me he could send me home with antibiotics but he said it was too late for her since it was in her entire body and to have her put down. I just didn't know it was THAT much!!!!!
I feel like the worst chicken owner ever!!!! This is my first time dealing with this situation so now I know what to look for in case, forbid my other girls have this happen.
RIP my sweet Coco girl

 

Thank you so much for your kind words, @Teila you are sweet! And so right! I didn't even think of her maybe hiding her illness. I guess it doesn't matter what species we have, it's a horrible loss when any of them pass away. They become a part of your family instantly.
The day after we lost her, I had a HEN, lose one of her Spurs. Yes, a hen! She lays eggs and everything. So not sure how that happened but I managed to stop the bleeding and she seems to be doing ok with that!
I tell ya, I wish they could just tell us when something is wrong! Haha!
Thanks so much again!!!!

 

I didn't know there was such a thing. She's been laying eggs up until maybe 5mos ago. I just assumed she was done or taking a break. Plus if I don't get them in time, the newer birds will peck the eggs open. But hers were a pinkish egg so not hard to miss.
Not sure if anyone can read this but this is what the lab sent back to me....

 

And thank you for your kind words, @Little Fuzzy

 

Thank you SilkiesForEver