Polo devoted her later years to her grandchildren. On 8 March 1972, her granddaughter María del Carmen married
Alfonso, Duke of Anjou and Cádiz, a member of the
House of Bourbon. Polo hoped that this "operation" would lead to her granddaughter becoming queen. In fact,
Juan Carlos ultimately succeeded to the throne. By that time, Franco was greatly diminished, both physically and mentally. With Franco's death, the family's fortunes changed dramatically. On 26 November 1975, six days after her husband's death, King Juan Carlos gave Polo the hereditary title
Señora de Meirás (English: Lady of Meirás), named after her and her husband's summer residence. She was also given the accompanying dignity
Grande de España (English: Grandee of Spain). The title and dignity were inherited by her grandson
Francisco Franco (who also became the 11th Marquis of Villaverde after the death of his father). In the ensuing years, Polo witnessed the disintegration of her family. On 31 January 1976, she left El Pardo for the last time. In 1978, her daughter was arrested at
Madrid Barajas International Airport for attempting to smuggle 300 million
pesetas worth of gold, jewellery and medals that had belonged to her father. Her granddaughter separated from her husband and moved to Paris, where she lived with the antiquarian
Jean-Marie Rossi. On 7 February 1984, Polo's great-grandson, Francisco was killed at 11 in a car accident. In her final years, Polo rarely left her house, hearing
Mass at home. She isolated herself completely, ignoring (and being ignored by) the press and refusing to read anything about politics or about her husband. She explained, "It is necessary to have much Christian resignation, in light of the turmoils of my life". Polo died in Madrid on 6 February 1988, at the age of 87, and was buried at
Mingorrubio Cemetery in
El Pardo. Her husband, who had previously been entombed at the
Valle de los Caídos outside Madrid, was exhumed and reburied with her on 24 October 2019. ==Ancestors==