Coturnix Adult Bloody Stool and Eggs without Shells- Help!

[Shmegel]

I tried boiled egg but not scrambled- she was totally disinterested. The mealworms get her eating whenever I offer them.

 

[Shmegel]

All of the girls in my flock suddenly stopped laying eggs for the last couple of days- can Corid do this? Is it a bad sign? And is there anything I can do to fix it?

 

[Wyorp Rock]

All of the girls in my flock suddenly stopped laying eggs for the last couple of days- can Corid do this? Is it a bad sign? And is there anything I can do to fix it?

Corid should not have anything to do with it.
I really don't know much about Quail, so hopefully the others will chime back in.

My thoughts if they were chickens - if All of them have stopped laying - is there stress (change in housing, feed, number of birds, fighting, etc.)?
Any signs of external parasites - lice/mites?