If she has been having issues like my girl had, with poor shell quality etc, I would continue to treat with calcium until she has stopped laying
If she's still laying an egg each morning, I would continue with the calcium until she's done laying. If she is laying good quality eggs and having no issue with soft or brittle shells, then I think its safe to take her off the calcium. I assume you're trying to get her to go through an autumn molt, so that she starts her winter break?
If so, I would ration her food as well as using the dark method, I struggled to get my girl to stop laying, the dark method didn't really work for her, but limiting her food worked very well (even though I felt so mean!)
I fasted Sprightly for one day (water always available) and then restricted her diet to mostly oats (wet oaty mash). After a few days of free feeding plain oats, I mixed in her food, about 50/50 duck feed to oats. And did this for a few more days, that's when I noticed her egg production starting to drop. I believe I supplemented her water/oats with vitamins, such as nutritional yeast in the oats, or a small dose of nutri drench in the water. I also monitored her very closely and ensured she was eating the oats and not starving herself.
The big change of diet/rationed food, along with the change in daylight hours, is what put her body into winter mode and what ultimately stopped her laying. If you do try this method, make sure you monitor her well and if you see any lethargy/negative changes in her, I would quit and go back to normal diet.