Margaret was one of the Valkyries who died while battling the fire giant Surt.

Magnus Chase and the Gods of Asgard

The Sword of Summer

Margaret came to Lyngvi with Gunilla, Irene, and Magnus' hall mates to apprehend Magnus, Sam, Blitz and Hearth. When Surt arrived and the Valkyries fight the fire giants. She died while battling Surt. A funeral was later held for her, Irene and Gunilla.

Magnus Chase and the Gods of Asgard
Core Series: The Sword of Summer | The Hammer of Thor| The Ship of the Dead
Main Characters: Magnus Chase | Alex Fierro | Blitzen | Halfborn Gunderson | Hearthstone | Mallory Keen | Samirah al-Abbas | Sumarbrander | Thomas Jefferson Jr.
Minor Characters: Annabeth Chase | Frederick Chase | Gunilla | Randolph Chase
Norse Gods: Freya | Frey | Thor | Loki | Odin | Frigg | Ullr | Vidar | Heimdall | Sif
Minor Gods: Hel | Mimir | Ran | Aegir
Jotnar: Surt | Utgard-Loki | Ymir
Monsters: Ratatosk | Jormungand | Fenris