[1] Immediately prior to her appointment as deputy chief justice, she was a Justice of the Court of Appeal of Uganda, which also serves as the Constitutional Court of Uganda.
She also holds a Diploma in Legal Practice from the Law Development Center in Kampala, Uganda's capital and largest city.
She attained the mandatory retirement age of 70 years in 2012, when she stepped down from the Court of Appeal.
[5] In 2010, Justice Mpagi-Bahigeine was a member of the panel of Appellate Court judges who ruled 5–0 to dismiss the treason charges against opposition politician Kizza Besigye, and 10 other co-accused individuals.
[6][7] On her retirement, she spoke against laws that discriminated against women and their ability to procure a divorce.