Lilly, who struggles with anxiety, is currently being home schooled after being bullied.
Rachel said of the cancelled meet and greet: “It was terrible because she stood there, waiting, fully expecting it.
Lilly had been excited about meeting someone she had looked up to for years, she said, and the let down had left her more worried that things would not go her way.
After writing to Martinez’ manager, Rachel was promised a new meet and greet when the singer is next in the UK.
She will also be given some new VIP merchandise.
The new offer of a meet and greet has “helped Lilly massively”, Rachel said.
“It has especially helped her understand it was a bit of a mishap this time,” she said.