LeFevre was born and raised in Wisconsin, and began playing viola in the fourth grade in the public school music program.
LeFevre was awarded the Strelow Scholarship at the University of Wisconsin at Madison, which paid her full four-year tuition. She graduated with distinction. After graduation, she studied for a year at the Sweelinck Conservatory in Amsterdam, where she studied with Matthias Maurer, the principal violist of the Concertgebouw Orchestra. LeFevre returned to the United States and enrolled at the Yale University School of Music, where she studied under Jesse Levine and Kazu Isomura of the Tokyo Quartet. At Yale she earned a Master of Music and an Artist Diploma, and was awarded the Elizabeth Battel Stoeckl Award for excellence in Chamber Music.
LeFevre has had an active orchestral and chamber orchestra career in the United States and Europe. In addition to her current positions in Houston, she was the principal violist of Mercury Baroque, the principal violist of the Louisiana Philharmonic Orchestra, acting assistant principal violist of the Charlotte Symphony. She has played with the Nederlands Philharmonic Orchestra, the Granada Symphony Orchestra, the Chicago Sinfonietta, the Milwaukee Ballet Orchestra, and the New Haven Symphony. She has recorded with Ahmad Jamal and the Assai Quartet. She has also performed seasonally in many festivals, including the Grand Teton Music Festival, the Peninsula Music Festival, Music on the Hill in Rhode Island, the Madison Chamber Music Festival, the Colorado Music Festival, where she played with Lynn Harrell, and the Amelia Island Chamber Music Festival, where she performed with Michael Tree and Elmar Oliveira.
Currently, LeFevre teaches at the University of Houston Moores School of Music where she is an affiliate artist of viola. She is a member of the Houston Grand Opera, which she joined in 2005. She is co-principal viola of River Oaks Chamber Orchestra in Houston. She has been with ROCO since its founding in 2005 and was its associate artistic director from 2012-2016. She regularly substitutes with the Houston Symphony, and plays with Ars Lyrica and Musiqa. She is a member of the faculty at Texas Strings Camp in Austin.