Kate was born and brought up in north Wales, attending the Alun School in Mold before studying Social and Political Sciences at King’s College, Cambridge.
Cafodd Kate ei geni a’i magu yng ngogledd Cymru, gan fynychu Ysgol Alun yn yr Wyddgrug cyn astudio Gwyddorau Cymdeithasol a Gwleidyddol yng Ngholeg King’s, Caergrawnt.