[1][2][3] Rajnauth-Lee graduated from the University of the West Indies in 1976 with a Bachelor of Laws (First Class Honours), continuing her education at the Hugh Wooding Law School.
From 1981 until 1985 she was a state counsel in the Office of the Solicitor General; from October 1985 until January 2001 she was a lawyer in private practice in Trinidad and Tobago.
From February 2001 until October 2012 she was a Judge of the High Court; in the latter year she became a Justice of Appeal of the Judiciary of Trinidad and Tobago, in which position she remained until joining the bench of the Caribbean Court of Justice.
[4] Rajnauth-Lee has been active in the fight to combat sexual violence against women.
[5] She serves as vice-president of the Caribbean Association of Women Judges.