hayley grimes , 42 , was just a teenager when she found the body of baby peter wrapped in a blanket and sainsbury 's bag in weasenham st peter , norfolk .
emerged that the boy 's mother had been arrested over the child 's death 27 years later .
the girl who found a baby 's body floating in a village pond in 1988 says she can no longer be ` blamed ' for dumping the boy .