[12] She broke two records at the Portage Park Invitational Senior Meet in Chicago, with a 20.5 in the 40-yard freestyle, and a 1:52.8 in the 160 yard individual medley on February 4-5, 1967.

Allsup was a 15-year-old Sophomore from Bloomington High School, and two other qualifiers, Kathy Seidel at 14, and Erika Bricker at 15 were equally young.

Alsup subsequently trained with other members of the U.S. team in Palo Alto, and Los Angeles prior to the Olympics.

The Head Women's Coach for the 1964 Olympics was Peter Daland, who coached the swim teams at the Los Angeles Athletic Club and the University of Southern California, and worked with Allsup and the U.S. Women's Olympic team during their training in Los Angeles and later in Tokyo.

[15][16] After departing on a flight to Tokyo on September 30,[15] Allsup represented the United States at the mid-October 1964 Summer Olympics.

[2] The relay finals team for the 4x100 freestyle consisted of Sharon Stouder, followed by Donna de Varona, Pokey Watson, and Kathy Ellis, who swam a noteworthy World Record time of 4:03.8. with lead off swimmer Sharon Stouder taking a commanding lead to help clinch the gold.

[10] On August 14, 1966, Allsup bettered her National record in the 100-yard freestyle with a time of 54.5 seconds at the Central AAU Short Course Swimming Championships at Illinois State.

Her husband Richard had a Bachelors and Masters Degree from the University of North Dakota and worked as a teacher at Bullock Creek High School in Sanford, Michigan.

The couple continued to live in Sanford about ten miles Northwest of Midland, Michigan where Lynne worked.

[4] Allsup was an avid cyclist, taking trips with her husband Richard in Minnesota, and Wisconsin, and also enjoyed hiking in the Western United States and Canada.

[1][4] She died in the early morning of May 17, 2023, at Independence Village of Midland, and had been pre-deceased by Richard Odell Olson, her husband of 27 years, in 2012.