England's Kildunne set to miss Women's Rugby World Cup quarter-final with head injury
The 2024 world player of the year was forced off early in the second half in Brighton after a worrying whiplash incident.
England finished top of Pool A by coming from behind early on against the Wallaroos to equal their own record of 30 successive Test wins.
Success, however, came at a cost with outstanding full-back Kildunne facing a mandatory minimum 12-day stand-down period after showing concussion symptoms, while powerhouse loosehead prop Hannah Botterman left the Amex Stadium field before half-time due to a back spasm.