Laura Price and her 10-year-old cousin were both in the crowd when a bomb killed 22 people at an Ariana Grande concert last week.
But she says she’s “excited” to take him back to see the singer again at Old Trafford cricket ground this Sunday.
The likes of Little Mix, Katy Perry and Justin Bieber will also be there.
“Terrorists want to stop your way of life,” Laura tells Newsbeat. “And the best thing to do is all unite together and push through it.”
‘I can’t forget the smell’
Laura isn’t an Ariana Grande fan herself, but agreed to take her cousin Aaron, who has autism, along last Monday after someone else dropped out.
“We were at the exit next to where the explosion happened. When the bomb went off people started running towards us and that’s when the panic set in.
“A lot of parents were trying to keep their kids calm, telling them it was a broken speaker, but as soon as you got out you could smell this awful plastic smell and the smoke was so thick.
“You just knew it wasn’t a speaker or a microphone, you knew it was something a lot more harrowing.”
She says the scariest bit was not knowing what would happen next.
Image caption Police wheel take a person away on a stretcher after the blast
“The only thing that was going through my head was that there was going to be people following with guns.
“That’s when I thought, ‘We need to get out of here, quick.'”
She managed to keep her cousin with her in the crowd and they eventually escaped.
“I want to say a big thank you to the stewards and security who were there on the night,” she says.
“They’re just normal human beings, a lot of them students, and they all stayed so calm. They really deserve a lot more recognition than they’re getting.”
Image caption Tributes and flowers have been left in St Ann’s Square in Manchester
All proceeds from the One Love Manchester concert are going to a fund set up for victims’ families.
Those who were there last Monday – like Laura and Aaron – have been offered free tickets.
Organisers say they’re putting extra security in place and have asked people not to bring bags.
“I think putting this concert on was a fantastic decision and I think Ariana Grande has been so brave through the whole process,” says Laura.
Image caption Security is expected to be tight at the Old Trafford cricket ground
“Although she is a celebrity she’s still a young woman and it must have affected her just as much as it’s affected everyone else.”
She admits going back to a big concert will be an “anxious” experience, but it’s also something she’s excited about.
“You don’t know what’s going to happen, you don’t know where it’s going to happen.
“You just need to grab life by the horns and just do the best you can with it and have the best time.”
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