She died in Thor's arms after using his former hammer, Mjölnir, drained her of the last of her life energy. Jane, who took on the mantle of Mighty Thor in the film, died during her and Thor's (Chris Hemsworth) final battle against Gorr.
The second post-credit scene for Thor: Love and Thunder comes at the end of the credits and it explains what happened to Jane Foster (Natalie Portman) following the end of the film. What Happens in 'Thor: Love and Thunder's' Second Post-Credit Scene?