On 4 July 2022, the president, on the advice of the Judicial Council and in consultation with the Council of State, nominated Ackah-Yensu, along with three other judges (George Kingsley Koomson,
Samuel Kwame Adibu Asiedu, and Ernest Yao Gaewu) to the
Supreme Court. On 25 July 2022, the speaker of parliament,
Alban Bagbin, announced the nominations in
parliament and referred them to the appointments committee for consideration. On 18 October 2022, Ackah-Yensu was vetted by the appointments committee, and on 7 December 2022, the appointments committee recommended her approval, along with that of Samuel Adibu Asiedu to parliament. According to the committee, "the two nominees demonstrated dexterity in the knowledge of the law and showed character and competence." They also added that "they pledged to interpret the law without fear or favour and eschew partisanship in their rulings." On 11 December 2022, the Parliament of Ghana unanimously approved her nomination. She was sworn into office by the president, Nana Akuffo-Addo, on 28 December 2022. ==Other professional activities==