My question is, why would you want to use egg shells? I just don't see what benefit this would offer over the normal calcium supplement.
There are a lot of reasons that the eggs may not be surviving, including her young age, low fertility from the male (is he so young as well?), temp fluctuations, incubation substrate/humidity problems....the list goes on and on.
2-3 mice per week is a bit much, and if she is getting that much fat, it is very likely that she does weigh quite a bit, but that doesn't mean she is ready to breed at only a year and a half old. Is she getting just plain calcium, or calcium with D3 as well?
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