She received her bachelor's degree in education from Northern Illinois University and her master's degree in counseling psychology from Adler School of Professional Psychology.
Holmberg worked as a teacher in the Rockford Public Schools and was an instructor at Rock Valley College.
In the 1982 general election, Holmberg defeated Republican incumbent W. Timothy Simms to represent the 34th legislative district.
Dave Syverson, a Republican, defeated Holmberg in the 1992 general election.
[2] Holmberg died at Fairhaven Christian Retirement Center in Rockford, Illinois.