Sinatra used her husband's fundraising prowess to found the Barbara Sinatra Children's Center, which a spokesperson said has allowed thousands of children to benefit from therapy.
Before marrying Frank Sinatra, Barbara Sinatra worked as a model and Las Vegas showgirl. They were married for 26 years until he died in 1998.More news: Newborn killer whale calf dies, SeaWorld San Antonio announces
She spent time at Frank Sinatra's home while she was married to his neighbour, comedy brother Zeppo Marx.
Over the years, Frank and Barbara Sinatra played an active role in the children's center. Theirs was the longest lasting of the singer's marriages.
Barbara, who rose up the social ladder as "Lady Blue Eyes", died almost 20 years after her late husband in her Rancho Mirage home after months of declining health, the director of Barbara's Children's Center Hospital confirmed to the Daily News.More news: Celtic and Linfield could potentially face tough sanctions from UEFA
She is survived by her son from a previous Robert Oliver Marx, his wife Hillary Roberts and her granddaughter Carina Blakeley Marx. She married Sinatra three years later in 1976. "You worry about new ones, '", Barbara previously said.
Barbara and Frank founded together the Barbara Sinatra Children's Charity Centrer in Rancho Mirage, California, in 1986. Barbara Sinatra was known for her activism for children, raising money for a facility that would provide services and counseling for kids suffering from abuse. "There are several child advocacy centers like it around the country, [but] this one is probably most recognized".More news: Musicians behind Despacito demand Venezuelan leader stop using hit song as 'propaganda'