[1] In 2007 she presented, together with María Rachid, her partner at the time, the first judicial protection for declaring the unconstitutionality of two articles of the civil code that prevented marriage between people of the same sex.
In February, Rachid and Castro went to the civil registry to take their turns to get married, accompanied by María José Lubertino (then president of INADI), several deputies, lawyers, and a clerk.
When their request was rejected, they filed the first judicial protection in Argentina and Latin America to declare the unconstitutionality of two articles of the civil code that prevented marriage between persons of the same sex.
[12][13] She collaborated on the promotion of laws on medically assisted reproduction [es] and gender identity, the introduction of days of "lesbian visibility" and "rights of trans people", and the creation of the Women's Parliament, for which she is an alternate authority.
Esteban Paulón, president of FALGBT, mentioned her as "an indisputable reference in what makes the struggle of lesbians and bisexual women for visibility and against violence.
[4][5] After being in a relationship with María Rachid and following the sanction of the Law of Equal Marriage, she married Flavia Massenzio, also a lesbian activist, with whom she has a daughter named Estefanía.