By 2255, Ensign Detmer served as the helmsman of the USS Shenzhouunder the command of Captain Philippa Georgiou. (DSC novel: Desperate Hours)
In the course of the next year, she was promoted to the rank of Lieutenant junior grade, and she piloted the Shenzhou in the opening engagement of the war against the Klingon Empire. (DSC episodes: "The Vulcan Hello", "Battle at the Binary Stars")
In the wake of the battle, she was promoted to full lieutenant, and despite the serious injuries that she suffered on her face, she was assigned to the USS Discovery under the command of Captain Gabriel Lorca.
Source: Memory Beta