In November 2017, she was appointed Minister for Housing and Regeneration, and in December 2018 she joined the Cabinet as Minister for Finance and Trefnydd.
Ym mis Tachwedd 2017, fe'i penodwyd yn Weinidog Tai ac Adfywio, ac ym mis Rhagfyr 2018 ymunodd â'r Cabinet fel y Gweinidog Cyllid a’r Trefnydd.