In my background I had Odin killed in the first attack on Asgard by the Sentinels. Astrid is also about thirty years younger than Kaia. Although, I did have a period where Loki and Amora ruled Asgard, and then Loki was overthrown. Amora later freed him from confinement and reignited the civil war for control of Asgard. So maybe Loki could have retrieved Astrid once he got free and brought her in a failed attempt to take out the rebel leaders?<br/><br/>I imagine in this case Kaia wouldn't know of Astrid at first except from comments by her mother but they'd meet in-game.