Longstreth played second home for Haverford Township (Pa.) High from 1951-54. She was the captain and MVP in 1954. Longstreth continued playing second home at Beaver College from 1955-58. She was captain of the 1957 and 1958 teams, and was honored as MVP in 1958. During her sophomore year, she was named to the U.S. team. She played first home on the U.S. team from 1956-64, and then again in 1967.
At the time of her induction, Longstreth had coached high school and club lacrosse for more than 17 years, and has more than 20 years umpiring experience, 15 of which are on the national level. She pioneered women's lacrosse on the West Coast in the 1970's, including four years as the club lacrosse coach at Stanford. She also founded Longstreth Sporting Goods during that time.
Longstreth was inducted into the US Lacrosse Northern California Chapter's Hall of Fame in 2007.