Luminosity/Fridge

Fridge Briliance

At first it seems that Addy showing up is unrelated to Bella being smart - then you realize that the Volturi only met Addy because Bella informed then about Joham and hybrids, which caused Addy to join them.
Allirea's power explain's why hybrids are completely unknown.

In Luminosity, Allirea's state of rest - what happens when she's not actively exerting effort - is to be unnoticeable. This has always been the case for her. Anything that is clearly "about" Allirea is not worth notice unless she acts to counteract that default. She's also a half-vampire. This means that her mother died an agonizing death by childbirth. And no one cared.