Lamptey then pursued her tertiary education at the Workers College of the University of Ghana, where she earned a Bachelor of Arts degree in Law and Sociology in 1980.
Lamptey is a lawyer by profession, she started as a National Service Personnel at the Civil Defence Organisation from October 1987 to July 1988.
In 1995 she became the state attorney at the Attorney-General's Department and rose through the ranks till she was appointment Director of Public Prosecutions during the John Mahama administration.
[1] Alfred Woyome, a known financier of the National Democratic Congress, was charged by a Ghanaian court of fraudulently receiving a 52 million cedis judgment debt against Ghana.
In January 2018, after the official appointment of Martin Amidu as Ghana's first Special Prosecutor, the Ghanaian media began publishing Lamptey's name as his deputy.
[1] The Office of the Special Prosecutor was created by the Nana Addo Dankwa Akuffo-Addo administration in 2017 with the aim of allowing the independent prosecution of politicians and people affiliated with political parties or their members who are deemed as being corrupt.