Laura Smith and her two daughters Lehanna, 10, and Aaliyah, eight, were caught up in the horrific suicide bombing at Manchester Arena on Monday May 22.
Ariana Grande will now join a host of stars at Lancashire Cricket Club's Old Trafford ground for a charity gig on Sunday evening.
Fans who were at the show last week where 22 people died and dozens more were injured will be offered free tickets to the event.
Ariana Grande will hold a benefit concert on Sunday but many fans cannot go
But Ms Smith, from Hull, is livid that she is not allowed to register for the free tickets as they bought the original ones from a secondary resale website called 'Get Me In' and do not have the reference number.
The rules state that anyone who attended the original gig must be able to provide the full booking information to get in this week.
The mum had purchased four tickets for herself, her two daughters, and partner Luke for nearly £500 – double the cost price – because they were desperate to go on the day of the attack.
Lehanna, 10, and Aaliyah, eight, were caught up in the bombing at Manchester Arena on Monday May 22
However, Ms Smith, who is grateful to have survived the suicide bomb attack by Salman Abedi, 22, on Monday 22 May, may not be eligible to attend the One Love concert on June 4.
She told Mirror Online that she had been “trying to find the original purchaser on Facebook” but had received messages from other people who were there last Monday and do not want to go to the benefit concert.
Anyone who was at the concert was eligible for free tickets until 4pm today. Meanwhile members of the public can buy tickets from 10am tomorrow.
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Ms Smith, a finance manger, and her two kids narrowly escaped the bombing
The website where Ms Smith purchased the tickets from is run by Ticketmaster.
Ticketmaster told Mirror Online: “We are doing everything possible to extend the offer to all fans we can verify were at the show.”
Ms Smith said that on the night of the attack her eldest daughter, Lehanna, had wanted to go to the toilet at the start of the show but waited until the end.
The family rushed to the toilet as soon as the concert finished and shortly afterwards the bomb went off.
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She recalled how she saw smoke billowing up the stairs and a strong smell filling the arena. She kept her kids close to her and ran out of the arena.
The family then drove home to Hull and listened to reports on the car radio, realising that they were lucky to be alive.
They plan to lay flowers at the memorial to the victims on Sunday.
Ticketmaster is attempting to resolve the issue.