You are so very welcome, I truly hope this helps her turn the corner. If you have a moment in the coming days, can you let me know how things are going?
Oyster shell is a great source of calcium...is that what you mean by shell grit?
I noticed you are from Australia...do you have Tums available to buy over the counter? One tablet a day for a few days will give her a quick boost of calcium and could help her overall condition.
it’s so tough to...
I completely understand...I had 2/5 supposedly sexed chicks turn out to be roos and it broke our hearts to have to re-home then since by law we are not allowed to have them :(
It sounds like you are doing all the right things...given her history of being smaller, less robust than your other chickens, it sounds like a case of failure to thrive, with maybe something else going on that is causing her to decline more rapidly. Chickens sometimes don’t show obvious signs...
It does look like a follicle cyst of some sort. These can be lanced by someone who knows what they are doing, but unless the entire cyst sac is removed—it will keep coming back.