At the domestic level, Ishimwe plays for the Indatwa Hampshire Cricket Club.
[21] The second and final tournament contested by Rwanda in 2021 was the ICC Women's T20 World Cup Africa Qualifier, held in Gaborone, Botswana.
[22] Two days later, against Botswana, Ishimwe took 2/11, top scored for her team with 19 runs, and was awarded player of the match, which Rwanda won by three wickets.
[26] Meanwhile, in February 2022, Ishimwe was recruited to play in the privately run 2022 FairBreak Invitational T20 in Dubai, United Arab Emirates.
[28] In Barmy Army's first match, against Spirit on 5 May 2022, she caused a sensation, by bowling Spirit captain and recent World Cup winner Nicola Carey with her first ball of the tournament, and, later, by participating in a "wily run-out" of Thai player Nattaya Boochatham.
[29][30] The following day, against Falcons, she deflected a caught and bowled chance from another World Cup winner, Danni Wyatt, into another run-out, of the non-striker, Sri Lanka captain Chamari Athapaththu, who had scored an unbeaten century in Falcons' first match.