hayley grimes , 42 , found baby peter 's body in weasenham st peter in 1988 .
locals thought she was responsible because she wanted to give baby a proper grave , she says .
mother-of-two said : ` it was a shock . i still feel angry about the whole thing '
his body was exhumed last year for review which led officers to the mother .
infanticide charges dropped but charges may be brought for preventing lawful burial .