In June 2014, Rebecca was appointed Deputy Minister for Farming and Food, and in May 2016 she became Minister for Social Services and Public Health.
Ym mis Mehefin 2014, penodwyd Rebecca yn Ddirprwy Weinidog Ffermio a Bwyd, ac ym mis Mai 2016 daeth yn Weinidog Gwasanaethau Cymdeithasol ac Iechyd y Cyhoedd.