Hello Joe Pet,
Great job, with the information gathering!
I think Eggcessive has good advice for a treatment plan. And, if you didn't see an egg just inside the vent, then, as Eggcessive said, it could be an internal laying issue.
I have treated my hens, with a dose of Nutri Drench vitamin supplement, to give them a boost.
The warm soak will also be helpful, but, I like to add
a cup of Epsom Salt (magnisium sulfate) to a tub of warm water. The water level should be up to her vent. Soak for at least 5 minutes, then towel dry, and, may need to use a blow dryer if it is cold where you live. The magnisium sulfate helps the hen metabolize calcium. Also, offering green leafy vegatables (
kale, collard, cabbage, chard) and a bit of cold water fish (mackerel, salmon, tuna) will boost internal magnesium naturally. After this, it will be up to the hen to recover.
Sounds like her general health is good, that will give her the edge she needs.
Hope this is helpful.
God Bless!
