Bordallo was born in San Pedro Coahuila, Mexico, where she lived with her parents and six brothers until moving to the United States. Her father was a milliner and businessman. In 1978, she got married and crossed the border with her new husband. They arrived in Florida and stayed to work in agriculture, from there traveling to Virginia, the Carolinas, Tennessee, Georgia, and anywhere they were needed. They had three children. In 1986, they decided to settle on Johns Island because they wanted a more stable life and better educational opportunities for their children. They kept working on the fields and lived in a camp located on River Road. There, they met the sisters of Our Lady of Mercy, who visited the families and helped them to access community resources. Aspiring to a better quality of life for her family, Bordallo strove to acquire their own house through Habitats for Humanity. Bordallo and her husband regularized their legal status by accepting the amnesty granted by the Reagan administration and later became US citizens.Bordallo nació en San Pedro Coahuila, México y allí vivió junto a sus padres y seis hermanos hasta que emigró a Estados Unidos. Su padre fabricaba sombreros y se dedicaba a los negocios. En 1978, se casó y con su flamante marido cruzó la frontera. Se instalaron en Florida para trabajar en el campo y desde allí viajaban a Virginia, las Carolinas, Tennessee, Virginia, Georgia, donde quiera que hubiera trabajo en la cosecha. Tuvieron tres hijos. En 1986 pensando en el bien y la educación de los niños decidieron establecerse en Johns Island. Al campo donde vivían, ubicado en River Road, comenzaron a llegar de visita las hermanas de Our Lady of Mercy y ellas los ayudaron a acceder a recursos comunitarios. Aspirando a una mejor calidad de vida para su familia luchó para conseguir su propia vivienda con Habitat for Humanity. Bordallo y su esposo se acogieron a la amnistía otorgada por el gobierno del presidente Reagan y más tarde se convirtieron en ciudadanos americanos.
