The body of Sara Sharif, aged 10, was found at her home in Woking, prompting a murder inquiry.
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Jacquie Chambers, head of St Mary's C of E primary school in Byfleet, said Sara would be "dearly-missed".
Three people who travelled to Pakistan before her body was found are believed to have gone to Islamabad and are wanted for questioning.
Ms Chambers said: "She was a bubbly, confident little girl who had the most beautiful smile. She was full of ideas and was very passionate about the things she believed in."
'Grieve and recover'
The head teacher said the pupil had been in Year 5 at the school, adding: "Sara will be dearly-missed and, as a school community, we are all deeply affected by this tragedy.
"Our thoughts, prayers and sympathy are with those affected by this heart-breaking news."
Ms Chambers said she could not make further comment due to the police inquiry, but said the school was "fully supporting partner agencies with their investigations".
She added: "Our priority now is to support our school community as they grieve and recover."