Frantzen’s work has shown at the Smithsonian’s National Portrait Gallery
, the Butler Institute of American Art, the Cedar Rapids Museum of Art, the Denver Historical Museum, and as an award winner in the Portrait Society of America’s International Portrait Competition
. Her work is in the permanent collections of the Figge Art Museum, the Dubuque Museum of Art, the Cedar Rapids Museum of Art, the Brunnier Art Museum, the USDA, and the World Food Prize.
Frantzen is a frequent demonstrator, guest lecturer, and panelist discussing art and the artist’s life in the 21st century at museums and national art conventions. Her paintings have been featured in numerous national and international art magazines and journals, and she has been a frequent faculty member at the Portrait Society of America's Annual Conference, demonstrating portrait painting.