After a career dedicated to public health, as the founder of the Sickle Cell Association of Ontario, Lillie turned her attention to volunteering. While she continued to volunteer for Sickle Cell Disease, she also spent time in Jamaica as a Cuso International volunteer.
Working on two assignments over a 6-year period, Lillie helped open and run a medical clinic in Jamaica. It was a chance for her to apply her training in nursing, education and midwifery in her home country. The clinic now offers prevention, treatment and emergency care, as well as immunization, prenatal care and parent support for people who previously were excluded from such services because of poverty.
When she returned to Canada following her volunteer placements, Lillie continued to be a champion for Cuso International, helping to coach other volunteers who were about to leave on a placement. In 2011, she was awarded the Order of Ontario for her work with the Sickle Cell Association of Ontario.