The force said the Crown Prosecution Service authorised charges against Sara’s father Urfan Sharif, 41, Urfan’s partner Beinash Batool, 29, and Urfan’s brother, Faisal Malik, 28, all of Hammond Road, Woking.
They have also been charged with causing or allowing the death of a child.
The trio travelled to Pakistan a day before police discovered Sara’s body in Woking on August 10.
A post-mortem examination found the youngster had suffered “multiple and extensive injuries” over a “sustained and extended” period of time.
They were arrested on Wednesday evening at Gatwick Airport as they disembarked a flight from Dubai.
All three have been remanded in custody to appear at Guildford Magistrate’s Court on Friday.
Police said Sara’s mother has been informed of this latest development and is being supported by specialist officers.
Five of Sara’s siblings, aged between one and 13 years old, also travelled to the South Asian country on August 9 with Mr Sharif, Ms Batool and Mr Malik.