Amy Thomson opened the scoring for the Welsh side going on a 30m run and touching down under the posts after good approach work. With the wind being a factor throughout the game, the conversion was missed.
Llandaff continued on the front foot and soon added a further try from ex Wales U16 prop Roxy Lewis before scrum half Jody taylor showed impressive pace to add a third try on the stroke of half time.
Worcester hit back after the break and scored a well worked try 5 minutes in to the second half. They pounced on a North error and added a second try midway through the second period and despite a last minute opportunity to level proceedings, the Welsh side hung on for a famous 15-10 victory.