User blog comment:SonOfZeus1200/Hera/Juno's Choices/@comment-3146930-20120106164723

I believe that the 7 of the prophecy arent chosen, it is simply their destiny to take part in the Prophecy of Seven. Hera is more looking out for them and trying to bring them all together to stop the giants and Gaea. She may know which demigods are part of the prophecy, but because gods may not be able to see that far into the future, Hazel was beyond her sight.