Her headteacher Alex Clark, of Avenue Primary School, said the school community had been shocked by the death and their thoughts were with Ellie's family.
Ellie had many friends at school and this is a very sad time for us all. Ellie came to school every morning with a big smile on her face and was always giggling away about something. She was polite and well mannered and was a considerate member of the class, always kind and helpful towards her peers.
A man has been arrested following the unexplained death of a six-year-old girl in Sutton, south London. Two paramedic crews were sent to an address yesterday afternoon following reports that a girl had collapsed.
The girl, who hasn't been named, was treated at the scene before being pronounced dead at a London hospital.