She had a broken jaw and needed plastic surgery on her face. She also lost the sight in one eye.
Grandmother-of-two Ms Burch, who used to work as a receptionist, said: "My parents couldn't recognise me when they first came to the
hospital."
Her 10-year-old brother, John, was killed in the blast.
As well as the 44 deaths, 60 other people were seriously injured in the attack, which caused half of the school building to collapse.
Other eyewitnesses have claimed the pilot of the FW190 Fighter- Bomber waved to them in the playground as he flew at rooftop height over the school.
The rescue operation lasted two days as people searched through the rubble for survivors.
Ms Burch has recently paid a visit to the National Memorial Arboretum in Staffordshire where she has sponsored a tree dedicated to the memory of her brother and the staff and children who died in the attack.
The Arboretum is dedicated to all the people who gave their lives in the conflict, both civilian and members of the armed forces.
Ms Burch's tree can be found at the Wind in the Willows Wood children's site with the reference number 51/1151.
She said she felt it was necessary to provide a living memorial to those who died so they would not be forgotten.
A communal grave for the victims can be found at the Hither Green Cemetery in Verdant Lane, Catford, but Ms Burch says the memorial has been left in a poor state.
The children had originally been given marble headstones by the parents, but these were replaced by a war memorial for the borough's civilian dead.
Ms Burch said: "When the council decided to incorporate all the borough's civilian dead together, it would seem their choice of material was not all it could have been.
"No sooner do undertakers replenish it than it gets worn away again.
"You'd need a pair of glasses to try and find the graves now.
"In five or 10 years, you won't be able to tell they were there."
Rebuilt in the 1950s, the school, now called Sandhurst Primary and Junior Schools, has its own commemorative stained glass window in the infant hall and a recently built memorial garden.
The school says it still gets visitors coming in to ask about the bombing more than 60 years later.
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