Start with "1 tablet" of calcium citrate daily - you'll notice the actual dosage differs per brand but for the most part it doesn't matter, though with some research here: https://www.backyardchickens.com/th...-people-calcium-but-how-much-to-give.1606612/ a minimum of 300 mg calcium is recommended. While she continues to lay 2 per day I'd keep up with this dosage and you should see improvement in 5-7ish days, hopefully. Or better yet, she stops trying to lay multiple eggs a day.
Assuming this is a temporary thing and she slows back down in production, you can ease off on the tablets at that time. Reduce to maybe 1 every other day, and then 1 every 2 days, etc. - as long as shell quality is good you should be able to wean her off completely, and just have calcium supplemented on the side.
Assuming this is a temporary thing and she slows back down in production, you can ease off on the tablets at that time. Reduce to maybe 1 every other day, and then 1 every 2 days, etc. - as long as shell quality is good you should be able to wean her off completely, and just have calcium supplemented on the side.