[1] Hernández arrived on 19 December 2006 in Santiago, Chile from Madrid, Spain and Buenos Aires, Argentina after she won Miss Earth 2006 in the Philippines.

[23][24][25] She travelled to Singapore in April 2007 where she co-hosted the United Nations Environment Programme (UNEP) gala event, Champions of the Earth.

[26] She joined hands with students and teachers from Zhonghua Secondary School in Serangoon, Singapore to salvage young mangrove saplings from Sungei Buloh Wetland Reserve's mudflats.

Together with the United States Agency for International Development (USAID), she and Miss Earth Water 2006 Catherine Untalan took part in The Clean Air Campaign, as well as the promotion of the use of alternative fuel and recycling fairs in conjunction with other environmental groups.

[28][29][30] Hernández returned to the Philippines in September 2007 and graced the different environmental events in Marikina, starting off with waste segregation, visiting schools for the recycling campaign, and the launching of the waste water treatment system of Manila Water under the Metropolitan Waterworks and Sewerage System with Mayor Marides Fernando.

[32][33] She also participated in a fund raising event for the victims of the tragedy in Hậu River, conducted environmental forum with members of the press, addressed issues on pollution brought about by millions of motorcycles, the basic mode of transportation in Vietnam, discussed the protection of natural wonder sites like the Halong Bay,[29][34] planted commemorative trees, donated the amount of 50 million (Vietnamese đồng) to support the victims of the collapsed cable-stayed bridge Cần Thơ, promoted the development of sustainable tourism, conducted a motorcade around Hanoi and Ho Chi Minh City to promote the use of helmet and encourage safe and friendly driving to prevent accidents amongst the motorists, and the introduction of alternative fuels for the improvement of mass transportation to help lessen the pollution.

Then, continued to visit Bến Thành Market, one of the tourist symbol of Ho Chi Minh City and attended the Vietravel Exchange to meet with Vietnamese companies and visitors.

[38] She was also a guest at the Gala Dinner at Vinpearl Resort & Spa with performances by artists of Vietnam like Ho Ngoc Ha, Hien Thuc, and Duc Tuan.

[44] She travelled in February 2009 to Talca, Chile and served as one of the celebrity judges in the Miss Pelarco pageant which attended by about two thousand people.

[45] In addition to numerous trips around Chile, so far during her reign, Hernández had travelled to the Philippines, China, Puerto Rico, Bolivia, Singapore, Vietnam, Indonesia, Spain, Laos, New Zealand, Cambodia, Hong Kong, and Argentina to promote environmental awareness and to grace the national pageants.