After a defining victory against India in the first T20I, Australia have been handed a blow as spinner Jess Jonassen has been sidelined.
Alyssa Healy, who returned to form in the ongoing tournament will bat at number 3.
McGrath scored an unbeaten 93* off 51, which included 12 fours and four sixes.
Adelaide Strikers secured a six-wicket victory over Perth Scorchers in the twentieth game of the Women's Big Bash League on Friday.
The Strikers moved to fifth place in the points table with this win.
The Adelaide Strikers will face the high-flying Sydney Sixers in match number three of the WBBL 2022 season.
The Oval Invincibles trash Southern Brave by five wickets in the final to lift the 2022 Women’s Hundred title.
The Hundred Women’s 2022 competition: The Southern Brave Women will face the Oval Invincibles Women for a shot at the title at Lord’s.
The Hundred Women’s 2022 competition: The Southern Brave Women will face Trent Rockets Women in an all-important Eliminator at Southampton.
Northern Superchargers women beat the Southern Brave by 20 runs on Wednesday.