Hope you get it under control. FWIW, my clutches were usually anywhere from 3-6. Keep an eye on her and watch for signs of egg-binding ... I believe you can often help them with that. I read about it a lot, but never had a problem with any of my birds, so I don't have any personal experience.
As far as calcium (and other nutrients) I used to make a mix for mine. I would use shredded and pureed fruits and veggies (or quality baby food in a pinch). Especially nutrient-dense foods like sweet potato. I added chopped peppers and broccoli as well. I used enough cornmeal to make it bake-able, and when I added the eggs I used shell and all, crushing them into bits so they'd be well mixed in (usually saved shells too). Milk as well, for calcium. It turns out like a very thick, lumpy cornbread mixture (weird color tho), and I'd bake that. After cooling, I'd break it into pieces and freeze what they didn't eat within a few days.
I used a good quality feed mixture, but I was never really satisfied that it provided enough variety. The mix was an easy way to get my smaller birds to eat lots of fruits and veggies, as well as providing eggshells.
I also cooked a mix of as many beans as I could find, with whole brown rice, and corn, and fed that in a separate dish.
Everyone seemed to love it, and I had very healthy birds. They raised babies with no problems (except one anxious-to-breed male cockatiel who used to start pecking the babies at about 3 weeks to get them out, hoping he could start again! I had to keep him separated from his female much of the time).
trish
