User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-5073970-20130910163208/@comment-3285234-20130911082214

I find her back story lackluster and simple. Unlike the other of the seven whose back stories are more intricate. Ex. Leo and Hazel's connection, Frank's life depending on a firewood, Annabeth's story with Thalia and Luke and nothing needs to be said with Percy and Jason.

Plus, everyone else of the seven still has their own ongoing storyline, Percy and Annabeth in Tartarus, Leo and Hazel's connection, Leo's 7th wheel storyline, Franks life depending on a firewood, Jason feeling useless. Piper? I can't think of anything going on with her.