Local Councillor Lisa Catherine Winnett has said the community is “totally devastated” at the news this morning.
Ms Winnet said: “My thoughts and prayers are with Lilly’s family at this devastating and awful time. I hope police work promptly now to find the perpetrator.
“We are a close-knit community here in Blaina and the impact this has had on all of us is immense.
“Since Lilly was reported as missing there has been extensive searches by family, friends and members of the community. On Monday police had drones searching and helicopters.
“I would like to thank everyone involved in the searches. This outcome is totally unimaginable for us all.”