Way stoked about this actually. Some big composers in films like Michael Giacchino got their start in games. You also see the reverse happening with some big Hollywood composers moving into games.
I only played a bit of Valhalla but I played all of Origins which she scored as well. Both games had excellent music. Also Modern Warfare 2019 which is another high production score.
Sarah Schachner's mentor was Brian Tyler, who scored AVPR. Say what you will about that one, it had a good score.
This performance at the Game Awards for Anthem a few years back was quite good. She scored the game but she's performing on the vocal modulation here: