She opened the batting for England when they won the 1973 World Cup, and, against International XI in England's opening game of the tournament, became the first woman to score a century in one-day international cricket.[1] In the same match, along with Enid Bakewell, Thomas set the record for the highest opening partnership in Women's Cricket World Cup history (246).[3]
She also played hockey at international level for Wales. She was a full-time P.E. teacher at Neath Girls' Grammar School.[4]