She was born in 1922 in Temuco, the daughter of Manuel Oyarzún Lorca and Ana Ivanovic Roccatagliata.
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She married Aylwin in 1948 and they have five children: Isabel, Miguel, José Antonio, Juan Francisco and Mariana, who was the Education Minister of Ricardo Lagos' government, and 14 grandchildren (among them, telenovela actress Paz Bascuñán).
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As the First Lady, Oyarzún changed in 1990 the Fundación Nacional de Ayuda a la Comunidad (FUNACO) en Integra, institution who helps children with extreme poverty.