I should mention yhat my Light Brahms has a history of laying two soft eggs at once when she comes into lay. This year she kaid one shelled egg and I don’t think she’s laid since. Keeping a close watch myself.Thanks. I took @Eggcessive's advice and gave her half a tums yesterday and again this morning. I also ordered enrofloxacin and I think it should arrive today.
Her activity level is back to normal. I noticed this morning that there were two soft-shelled eggs in the overnight poo pile, like they're just falling out of her while she sleeps. I've got my fingers crossed she'll get better.