Doctors fought to save her life but were unable to revive her.

An investigation into her death is now under way but police say there are no suspicious circumstances.

References on Internet social networking sites claim the youngster was being bullied.

Poppy was in foster care and living in Broadwell Drive, Leigh, at the time of her death and Nick Hudson, Executive Director for Children and Young People’s Services, said: “Poppy’s untimely and tragic death has shocked and saddened many people.

“However, there is an investigation under way into the cause of her death and as a result we feel it is inappropriate to speculate about what has happened until the outcome of the coroner’s inquest.

“Our thoughts at this time are with Poppy’s family, friends and all who cared about her at this difficult time.”

Lowton High School headteacher John Shanahan said: “Poppy was a lively, bright and friendly young person who was popular with both staff and students. She will be remembered for the care and consideration she showed to others as well as for her dry sense of humour.”

A Greater Manchester Police spokesman said: “At 7.30pm on Monday March 1, police were called to a house on Broadwell Drive. A 13-year-old girl was taken to hospital, where she later died.”

Thousands of people have already left messages of condolence on Facebook groups setup in remembrance.