User blog comment:FairyRaven/Fairy Tail Chapter 424: Avatar, Review and Commentary/@comment-24277053-20150316193039/@comment-24277053-20150316201232

Anyway they better address it when they are in Sabertooth at some point, just because Minerva and Erza settled things, and Erza forgave her, she is a member of Fairy Tail just like Lucy, so in a way Lucy forgave her, right?

No it doesn't work that way, being guild mates does not make Erza Lucy's surrogate. Lucy is her own individual.