I'd offer the oyster shell free choice now.A few of my girls contracted coccidiosis when they were younger and I successfully treated them all as a group, but I haven't done anything recently.
She seems to be eating well and doesn't have any issues pushing past the other hens to get her turn.
I haven't offered any oyster shells because I read that you shouldn't give them too much calcium before they start laying as it has nowhere to go. Is it possible she's not getting enough grit? I haven't offered it since I moved them outside.
Thanks for all the great info! I will check her crop today and see what I can find out.
Do you think it's possible there's something wrong with her vision?
Grit and Oyster shell are 2 different things. Grit is crushed granite and it's insoluble so is used in the gizzard to grind up food.
Oyster shell is used as a calcium supplement, it is "soluble" so when it's processed in the gizzard, some calcium is absorbed.
As for can she see or if something is wrong with her vision, you'll have to observe her and take note if anything is off.
LOL Well, her sister knew what was good. Coconut oil will make for a loose stool, helps get things moving. It won't hurt her sister to have it, it's just a bit of oil, no worries.