The attack, the second in a year, has gutted Jessica's family who are at a loss to explain why anyone would destroy the place they go to remember Jessica.

Jessica's sister, Rebecca Small, yesterday said she drove past the memorial about 10.30pm on Tuesday and all was fine.

But yesterday morning she received a call from someone who saw it had been knocked over.

"I know it was OK on Tuesday night, I purposely drove past it because it looks so lovely at night, all lit up with the lights," she said.

Bec just doesn't know why someone would destroy the memorial.

"Last time it happened Rob [her partner] put 40kg of cement [to secure it], so whoever did it had a really good go at it," she said.

Bec believes someone knocked the memorial over with a car.

"I just don't get why they did it," she said.

"When we put the flowers and lights in I thought someone might pinch them, but this is just so senseless."

And she hasn't discounted a more sinister theory behind the vandalism, believing it could be someone who knows something about Jessica's abduction almost 12 years ago.

"I do think it could be someone who drives past here and just doesn't want to be reminded," she said.

Still, the family is devastated by the incident.

"I know similar things go on at the cemetery sometimes. People go up there and smash angels and headstones, I just can't understand why they do it," Jessica's mum Rikki said.

Mrs Small encouraged anyone who knew about the vandalism to contact Bathurst police.

"But I'm not expecting anyone to have seen anything," she said.

"A lot of things have happened in this street which no-one sees. Why would it be any different this time?"

Police yesterday said they would not be fingerprinting the memorial because the weather would have already removed any prints.