User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-5774152-20130102004206/@comment-3146930-20130102004839

It is possible that what she meant was that no matter if Percy died at the hands of one of her minions or not, he would eventually make it to Tartarus. For example, if he died, his soul would go to the Underworld and she could capture him there.