During that time, she served as the Free State's Member of the Executive Council (MEC) for Public Works and Infrastructure from 2015 to 2018, and from 2018 to 2019 she occupied an expanded portfolio as MEC for Public Works, Infrastructure and Human Settlements.
[2] She served as Deputy Majority Chief Whip in the legislature until May 2015, when Premier Ace Magashule announced that she would join the Free State Executive Council in a reshuffle.
In Ntombela's first reshuffle, announced in May 2018, Kotzee retained the Public Works and Infrastructure portfolio and was additionally allocated responsibility for the Human Settlements portfolio, making her MEC for Public Works, Infrastructure and Human Settlements.
[4] The following year, Kotzee left the legislature and the Executive Council after the 2019 general election; ranked 25th on the ANC's party list, she did not secure re-election to her seat.
[2] As of 2022, she had returned to Lejweleputswa District Municipality, where she served as a councillor and Member of the Mayoral Committee.