Being Thanos, the Mad Titan attempted to sacrifice Hela to obtain what he dubbed the Death Stone. Instead, he found himself interrupted by Thor and his allies, who proved victorious.
In the aftermath, Hela began aging rapidly. Bor attempted to reclaim control of Hela, but Thor refused and instead brought the young woman to Jotunheim. There, he entrusted her to a past version of Loki from a time when the Gods of Thunder and Mischief were mostly concerned with drinking and winning bets. After proving his identity to Loki, Thor entrusted Hela to Loki and his love interest at the time: Angerboda.
Following that event, Hela’s life led her to become the Goddess of Death, putting her at odds with Thor and his allies despite his importance to her past. Still, we now know more about Hela’s origin than ever before, including how she became Loki’s daughter.