Career
Demecillo has set a record in the history of De Louisiana Salle University for the school"s first ever UAAP beach volleyball championship title. She is also referred to as "Cyd", "Thea" or "Didit". Her family is quite famous in Cebu for their family-owned business Cydelicious Lechon Manok.
She graduated high school from the University of Southern Philippines Foundation where she played the Middle Hitter position.
She took up Bachelor of Arts-SPM (Bachelor of Arts in Sports Management) and graduated in February 2015. She is currently on her 5th and last playing year in the University Athletic Association of the Philippines with 2 championship titles.
She has also played in UAAP"s beach volleyball tournament (alongside Kim Fajardo, Ara Galang and Ernestine Tiamzon) and has given her university its first ever record of gold medal for the said tournament.