That is one gorgeous Speckled Sussex!Yes, they can recover, even if the internet would have you thinking otherwise.
Miss Lorraine popped out one of these a few months ago, a day or so after a softshell. Her general constitution was decent, so while concerned, I didn't intervene. I told DH that Lorraine had probably laid her last egg (he likes her dark eggs because James Bond liked Marans eggs).
A few weeks later, Lorraine was suddenly laying normally, with dark bloom for a 4-year-old.
Lorraine is a character. She has no problems starting something with any hen outside her group. She's how we know Unquestioned and Most Esteemed and Illustrious Head Hen Brahma Donna's still unquestioned. On the rare occasion Donna deigns to accept Lorraine's demand for satisfaction, it only takes a few flogs from Donna's little Brahma legs for Lorraine to back down.
Here she is starting something with Lil Nugs at the fence.
View attachment 4117761