User blog comment:FairyRaven/Fairy Tail Chapter 314: Erza vs. Kagura, Review and Commentary/@comment-4688536-20130111134705/@comment-36.68.211.31-20130111142147

kokorochas, maybe after heaven tower arc, someday milliana met with kagura, who is spending his entire life searching for her brother, asking many people even mentioning her brother's name, so thats when milliana heard of his name(simon) and told kagura what she had known, tough she didn't know whad happened in the tower