[2] In 1961, playing with future husband John Thornhill, they reached the final of the Worplesdon Mixed Foursomes, losing to Frances Smith and Bruce Critchley.

[5] In 1965 she gained international honours, playing for winning England teams in the Women's Home Internationals and the European Ladies' Team Championship and for Great Britain and Ireland in the Vagliano Trophy, the Continent of Europe winning for the first time.

[8] The following week she won the Newmark International at Walton Heath, threes strokes ahead of Anne Stant.

[11] Later in 1983 she won the British Ladies Amateur beating Regine Lautens, 4 and 2, in the final at Silloth on Solway.

[13] Thornhill made her Curtis Cup debut at Muirfield in 1984, the Americans winning by a single point.