This page contains information regarding Star Trek: Discovery, and thus may contain spoilers.
Following Lt. Cmdr. Airiam's death, Nilsson attended her funeral. Later, she replaced the lieutenant commander as the new spore drive ops officer on the bridge. (DIS: "The Red Angel") Captain Christopher Pike commended her, noting she had "stepped up for Airiam in a way that honors her." (DIS: "Such Sweet Sorrow")
During the Battle near Xahea, she assisted Tilly in getting Stamets to sickbay, insisting Tilly get back to the bridge. She tried to stay with Stamets while also lending Doctor Tracy Pollard a hand during the crisis. After the battle, she was presumed dead by Starfleet, based on the testimonies of the USS Enterprise senior staff. (DIS: "Such Sweet Sorrow, Part 2")