African Rock laying eggs without a male

I have a eight year old African Rock who has laid six eggs without ever having been with a male! i called Bob Clark and he said it has happened with Retics,Burms and Boas but he has never heard of an African Rock ever doing this. i sent him pictures and he said she may be the first in this country to ever have done this. does anyone know of any other African Rock ever doing this? p.s. her eggs are infertile at least the ones laying outside of her body,she may have more coiled up with her.