Javeria was injured while batting during Pakistan’s opening match against the West Indies in Chennai on Wednesday and has been ruled out of further participation in the tournament.
21-year-old Ayesha is a right-handed top-order batter, who played two T20Is against the West Indies in Grenada late last year.
Javeria Khan, who opens the batting for the Pakistan women’s team, has been released from hospital after the injury.
“She has been discharged with a fractured thumb but we are still waiting for the medical report,” team manager Ayesha Ashhar said.
The 27-year-old Khan was struck on her thumb by a bumper from Shamilia Connell that then hit the grill of her helmet.
Khan collapsed to the ground and was stretchered off the field before being taken to hospital.