Besides dedicating her life to finding her family members, she fought for thousands of Argentineans who disappeared during those seven years of dictatorship. From 1976 to 1982, 30,000 people went missing, according to official sources.
In 2017, Sotelo testified in the trial against seven repressors for the crimes committed against 352 victims who were held captive in clandestine detention centers such as Atletico, Banco, and Olimpo.
In those centers, repressors tortured and killed what they called "traitors," who were, on many occasions, people not linked to politics.
After over 40 years of continuous searching for the disappeared, Mothers of Plaza de Mayo discovered the real identities of 128 of the 500 infants snatched from their parents and given to other families during the dictatorship.