"Lieutenant Nilsson, You've stepped up for Airiam in way that honors her."
Lieutenant Nilsson was a female Starfleet operations officer who lived during the mid-23rd century.
In 2257, Nilsson served aboard the USS Discovery, and oversaw the deployment of a gravity simulator in the starship's shuttlebay to capture a fragment of an interstellar asteroid. (DIS: "Brother")
Later, she assisted Paul Stamets and Sylvia Tilly in the engineering when a spore hub failure occurred. (DIS: "If Memory Serves")
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")
Nilsson was played by Sara Mitich who previously played Airiam in Season 1.
Nilsson at Memory Beta, the wiki for licensed Star Trek works