Borglum is from Great Falls, Montana. She graduated from Charles M. Russell High School in 1995, where she was class president and governor of the Montana Youth Legislature. Borglum attended Pacific Lutheran University, where she earned a Bachelor of Business Administration. She received a Fulbright Scholarship, which she used to study oil and gas development in Oslo. After her brother, Troy, died in a traffic collision, Borglum went to Duke Divinity School, and earned a master's degree in theological studies in 2003. She then worked in pharmaceutical sales in Oregon and Texas.
Borglum attended Montana Technological University, where she earned a master's degree in petroleum engineering. She then enrolled at the South Dakota School of Mines and Technology to earn a doctoral degree in geology and geological engineering, while working as a production engineer in an oil field in North Dakota. She also enrolled at Montana Tech to earn a bachelor's degree in engineering, which she needed to become a licensed engineer. She was laid off from her job in 2015, and moved to South Dakota, where she worked as a staff engineer at RESPEC. Now she focuses on her United States Senate campaign.
In the 2018 elections, Borglum ran to represent the 32nd district in the South Dakota House of Representatives. She and Sean McPherson earned the Republican Party's nomination for the district's two seats, even though McPherson, an incumbent, had died of cancer. Governor Dennis Daugaard appointed Borglum to fill McPherson's vacant seat on August 8. She was elected to a full term in November.
She is now running in the Republican primary for the United States Senate against incumbent Mike Rounds in the 2020 elections.
Borglum and her husband, Tim, live in Rapid City with Tim’s two children, Cora and Jack.