Win was a lifelong Californian. She grew up in Oakland and graduated from Oakland Technical High School in 1942. She graduated from the University of California at Berkeley in 1948 and later attended graduate school at the Massachusetts Institute of Technology. She studied chemistry in an era when few women were in the sciences.
Tween married Ray Frazer in 1950 and moved to Claremont in 1952. She and Ray had five children and divorced in 1973. Win worked for many years as a chemistry teacher at the Joint Sciences Department of the Claremont Colleges, retiring in 1986. She was very proud that two of her granddaughters later attended Scripps College in Claremont.