Even in Death

Avani married into the Mikaelson family over a millennia ago. Unfortunately she died of plague before the family was turned into the Original vampires.

Or so they thought.

Only Esther and Mikael knew the truth of Avani's death, but now she's back and the three remaining Mikaelsons- Niklaus, Elijah, and Rebekah- will know the truth.

Eventually.

If you ask Addison, Avani's a bit melodramatic and she should have told her husband and in-laws that she was alive centuries ago, but Avani keeps insisting that she had her reasons.

Addison thinks Avani's full of shit.