The family lived in the town of Droylsden before they moved to Didsbury to be close to the Northern Lawn Tennis Club.

[1] The following year, Armstrong won the junior doubles event with Lorraine Coghlan during the 1956 Australian Championships.

[4] Armstrong earned a place on the British Wightman Cup team in 1957, playing doubles with Shirley Broomer.

She made the singles fourth round at Wimbledon in 1957 and reached the quarter-finals of the women's doubles in 1960 partnering Deidre Catt.

In 1960, her final year touring, she won several titles on the French Riviera tennis circuit.