When I've had pullets reluctant to eat OS, I sprinkled a few pieces on top of the feed for a few days, that seemed to help them 'get it' as they started taking it from the OS feeder soon after.
Also sprinkle some out with scratch grains(which I feed daily because I use a 20% all flock).
I also...
Could be either way...crop issue affects digestive system or other issue slow digestive and affect crop function.
This makes me <cringe>.
Sorry, am staunchly anti AB abuse/misuse. No one should have 'left over' AB's.
Plus how would you dose it for a chicken?
Much better option!
Could be egg membrane malfunction or shed tissue from intestinal or reproductive tract.
Hard to know if it's calcium issue.
Had she been laying previously to this incident?
Other birds laying OK?
What all and how exactly are you feeding?
Is her belly swollen(from just under vent to down between...