Olivia was with her close friend Adam Lawler when the pair were caught up in the suicide attack. Adam was rushed to hospital, where he was in a critical condition, suffering from severe blast injuries.

But no word has been heard from Olivia since she sent a text to her boyfriend half an hour before the explosion.

The lack of any news has left her family “in bits”, said Mrs Campbell.

Speaking at her home in Bury, she said: “I’ve been up all night ringing and texting people who might know where she is. I’m so exhausted I don’t know what time of day it is. It’s just horrendous.”

She added: “It’s so hard the not knowing what’s happened. If I had an answer then at least I’d know the truth.”

Adam’s parents bought him a pair of tickets to Grande’s concert for his birthday two weeks ago, and he wanted to celebrate it with Olivia - doing something they both loved.