[1][2] In August 2019, she was named in the West Indies' squad for their series against Australia.
[3] She made her Women's One Day International (WODI) debut for the West Indies against Australia on 5 September 2019.
[4] She made her Women's Twenty20 International (WT20I) debut for the West Indies, also against Australia, on 14 September 2019.
[5] In June 2021, Gajnabi was named as the vice-captain of the West Indies A Team for their series against Pakistan.
[6][7] In October 2021, she was named as one of three reserve players in the West Indies team for the 2021 Women's Cricket World Cup Qualifier tournament in Zimbabwe.