[3] In 1960 she won the British Girls' Stroke-play Championship at Ranfurly Castle, an under-21 event, a stroke ahead of the defending champion Diana Robb.

[4] In 1960, Greenhalgh made her debut for England in the Women's Home Internationals and in 1961 played for Great Britain & Ireland in the Vagliano Trophy.

[5][6] She missed out on selection for the 1962 Curtis Cup match but later in the year she reached the semi-finals of the Ladies' British Open Amateur Championship, losing 5 and 4, to Marley Spearman.

[11] She was selected for the Curtis Cup team for the 1966 match in Hot Springs, Virginia but later withdrew with an injured wrist, an injury that caused her to miss much of the next two years.

[14][15] In 1977, she led the qualifying for the Ladies' British Open Amateur Championship while in 1978 she reached the final, losing by one hole to Edwina Kennedy.