In March 1893, she was elected as an honorary president of Hui Aloha ʻĀina o Na Wahine (Hawaiian Women's Patriotic League) or Hui Aloha ʻĀina for Women. This patriotic group was founded shortly after its male counterpart the Hui Aloha ʻĀina for Men to oppose the overthrow and plans to annex the islands to the United States and to support the deposed queen. She resigned this position on April 17, 1893, after a dispute arose between two factions of the group over the wording to the memorial seeking the restoration of the monarchy to be presented to the United States Commissioner
James Henderson Blount sent by President
Grover Cleveland to investigate the overthrow. Later the same year, she met
Anagarika Dharmapala, a Sri Lankan Buddhist and activist who was travelling back to Sri Lanka from the United States. He hoped that she would support his fundraising efforts to return the
Mahabodhi Temple in
Bodh Gaya, India, where the Buddha is believed to have gained enlightenment, to Buddhist ownership. At their initial meeting, Foster shared her grief over her husband's death, and her anger and pain at the treatment of her friend Queen Lili‘uokalani; in response, Dharmapala taught her the principles of Buddhist meditation and began a lifelong interest in Buddhism for Foster. Over the next 40 years, Foster donated significant amounts of money to Dharmapala's Mahabodhi Society, which were used to support Sri Lankans in need as well as to negotiate for the ownership of Mahabodhi Temple. One of her projects, the Foster-Robinson Hospital for the Poor, is still part of the
National Hospital of Sri Lanka in Colombo. In Hawai‘i Foster was also a generous benefactor. She donated land along
Pali Highway for the building of the
Honpa Hongwanji Mission, the first Buddhist temple in Honolulu. She also supported Hongwanji High School, funded scholarships at
Kamehameha Schools, purchased beds at Kap‘iolani Hospital for indigent patients, and acquired land that would otherwise have been purchased by foreign investors, enabling native Hawaiians to live there. Foster died on December 30, 1930, and bequeathed her gardens and home to the city of Honolulu as a public garden, which later became the
Foster Botanical Garden. == Legacy ==