A "Soft Shelled" egg???

[WasabiChicki]

I've been dealing with my sick RIR this week (see floppy comb thread) and today there was a soft shelled egg on the floor of the coop...
What is that, why & what do I need to know? (I lOVE this site!)
Thanks in advance!

 

[chicken241]

Give her egg shells. Its some thing my nana tought me when i first got chickens 7 years ago.

 

[moomee56]

Calicum, in the form of oyster shells (Which you can get at local feed stores), or eggs shells would harden the shells.

 

[WasabiChicki]

They get crushed egg shell daily, and oyster shells pretty regularly also. (We're currently out of oyster shell.)
They also free-range & are fed a lot of chicken friendly table scraps.
I don't think lack of calcium is an issue, unless she just isn't absorbing it properly..? Any other reason this may occur?