Frankenberg died at the age of 92 due to complications from a stroke suffered this year, the actress' representative, Susan Madore, told E! News.
Seymour headed straight home to England to be with her family and attend the funeral service.
"She's definitely missing the show this evening," Madore said.
Seymour, who is best-known in the United States for her starring role on "Dr. Quinn, Medicine Woman," has said she chose to compete on "Dancing with the Stars" because it was her mother's favorite series.
"My mother survived incredible challenges ... her health issues that she never complained about ... three and a half years in a Japanese concentration camp in World War II and the loss of her husband, John, who was the love of her life," Seymour said in a statement.
"However, she was always a beacon of love and hope for all she met and especially for my sisters Anne and Sally, and for our entire family. Her spirit was indomitable and will continue to live forever in our hearts."