Yes, you can post a picture if you can upload one. I use photobucket.com as its' free and easy. You sign up. Then it says "upload photos" or something therelike. You do that. It'll show the photos there in the same window. If you cursor over them, you'll get some options including one that says "IMG" with a box beside it. Select all of the text in the box, copy, then paste that into the typing box for this forum. It'll look something like [ IMG ] blah blah blah [ IMG ] when you're done. It won't look like a photo until you read it on the forums, so don't think you've messed it up if you only see text. (Like I did. )
The diet looks good. Sometimes getting older they just need "more". I'd just freshen the oyster shell a little, keep her on the layer. It's good to keep some cod liver oil around. If you see weird things happening with their laying, put some of the 'flour' from the oyster shell in their feed, and spray their feed with cod liver oil twice during that week (2 days apart) to give her a sure source of calcium and vitamin D. Sometimes that helps the "bobbles" like this.
The diarrhea could have been from that weird bobble she had. How's she doing now? Any eggs? GOOD on the improvement on the droppings. Sometimes also that can be an indication of a yeast infection. Or bacterial. In those cases I definitely do the yogurt for at least a week daily, and then I'd also think that using organic apple cider vinegar in the water helps all around in digestive issues. 1 teaspoon per gallon of water. The pH of the OACV gets the digestive tract pH back on track for good bacteria, unfriendly for bad bacteria and devestatingly unfriendly to fungal/yeast blooms. Plus the organic has yet more live bacteria (lactobacilli) and a little fiber in the bottom if you shake it up.
It might not hurt to give her system a gentle flush with a tiny bit of applesauce and cooked oatmeal in one feeding if she'll take it. The fibers of oatmeal (and it's soothing nature) and the pectin of the applesauce (and its cleansing nature) cleanse without causing diarrhea. They actually help with diarrhea because of the fibers and pectin acting as PREbiotic, something that increases the PRObiotic activity as the live bacteria thrive if given a little good stuff to eat.
I think she's on her way back to health without the extras, but they're there if you'd like to try them or to use later if you ever need them.
I'd love to hear how she does for you.