Is this her first season? I've had several females lay mostly to all infertiles in their first breeding season. How often are you introducing a male? How long are they left together? You can try reintroducing the male, but at times they will lay duds for the first year. Pretty much all of them have produced fine for me second season and beyond.
could be a number of things, from the male being a dud, to her not having enough resources to support eggs, but I doubt thats it as she wold just absorb the eggs, if it is her first year she might just need to go through a season before she produces vital eggs