Set to play India in the league stage on Sunday, which will decide the two qualifiers from Group A, Australia will be hoping for a positive fitness update about Vlaeminck, who was brought into the Australia side for the match against Pakistan after spending the team's opening two games in the dugout.
But the 25-year-old suffered what appeared to be a nasty injury in the field off just the fourth ball of the innings.
Vlaeminck chased down an outside edge, but her knee stuck in the ground as she attempted a slide, and on reaching out for balance she hurt a previously-injured shoulder.
Australia will be hoping that the injury isn't serious for a player who has suffered a string of unfortunate fitness setbacks in her career.
First capped at the age of 20, the pace bowler picked up a stress fracture in her foot to rule her out of the 2020 edition of this tournament, before also missing the 2022 Women's Cricket World Cup through a shoulder injury, and not recovering form and fitness in time to force her way into Australia's winning squad in South Africa in 2023.