Exactly - it is a lot of calcium. You can buy it in bulk as a powder both citrate and carbonate and with or without vitamin D.You can buy calcium tablets for humans Bob. The ones I've used you can crush to powder. Make a paste with a bit of water and honey and dip some bread in it , oor whatever and feed it to her.
Bear in mind that a high calcium layers feed is around 4.5%. To make life easy, assume a hen of 2.something kilos will eat 100 grams of feed a day. This means you need 4.5 grams of calcium powder fed during a day.
I have tried it all.
I have found popping the pills easiest if I want to be sure of getting it all in and done fast.