Armstrong was born in Belfast, Northern Ireland, and attended Down High School in Downpatrick.
[1] Her father, Lloyd Armstrong, played first-class cricket for Ireland in the 1940s and 1950s.
The following year, Armstrong was selected for the 1988 World Cup in Australia.
[5] Armstrong finished her international career after the 1991 European Championship in the Netherlands.
She played 20 ODIs in total, scoring 118 runs with a batting average of just 6.94.