[5] In 1958 she won the British Girls' Stroke-play Championship, an under-21 event, at Ranfurly Castle, winning by four strokes from Jean Letham.

[6] Porter won the 1959 English Women's Amateur Championship at Aldeburgh, beating Frances Smith 5&4 in the final.

[7] Later in 1959 she made her debut for England in the Women's Home Internationals, the first time the event was held separately from the Ladies' British Open Amateur Championship, and for Great Britain & Ireland in the Vagliano Trophy, the first time the event was played against a combined Continent of Europe team.

[10] On the opening day Porter lost her foursomes match 3&2, playing with Frances Smith, having been 9 down after 13.holes of the morning round.

In 1965 Porter won the English Women's Amateur Championship for the third time in seven years, beating Gillian Cheetham 6&5 in the final at Whittington Barracks.

[25][26] In May 1966 Porter reached the semi-finals of the English Women's Amateur Championship at Hayling, losing to Jean Holmes.

[30] Later in 1966 she was selected as playing captain of the three-player Great Britain & Ireland team for the Espirito Santo Trophy event in Mexico.

[32] In 1978 at West Sussex she reached the final of the English Women's Amateur Championship, losing 2&1 to Vanessa Marvin.