Egg binding is deadly within 48 hours.. usually death is caused by inability to poop and subsequent Sepsis... She's not egg bound.
Yes to possible crop issues. It should not be squishy. See if this article helps..
https://www.backyardchickens.com/ar...w-to-know-which-one-youre-dealing-with.73607/
The limping is still suspect. Were you able to feel any heat or swelling, or see any bruising, or other abrasion?
Separation is not preferred UNLESS the other chickens are picking on, bullying, or keeping her away from feed/water. Looks like she's still within their sight though, so that's good.
I see she's got peepers on.. and looks like a gold sex link.. some other reproductive issues aside from binding can effect these ladies. What is her age? Was she vaccinated against Marek's?
I hope you get answers and she recovers quickly!