Dienda joined the Congress of Democrats in 1999, the year of its foundation. She also held the position of the secretary of the Women Democrats Party. In 2007, she opposed the election of Ben Ulenga as party president.[7]
Dienda led a drive in the National Assembly which called for the distribution of condoms to prison inmates as a means of preventing the spread of HIV/AIDS. Dienda and other opposition politicians were shouted down, with Utoni Nujoma and Petrus Iilonga vocally opposing the idea. Several SWAPO members denied that sexual activities ever occurred in prisons.[8]
The PDM legislator said she does not support husbands and wives claiming rape in marriage. Dienda was responding to a point raised by the minister of home affairs, immigration, safety and security Albert Kawana, who asked whether there would be a conviction if boyfriends and girlfriends, or husbands and wives, claim rape when there is no semen and bodily fluids as part of the court evidence, during a parliament session in April 2022.[9]