And with her newly restored Rihanna-style hairdo, perhaps she should have been singing her pop idol's rather apt hit Umbrella.
Instead, 17-year-old Rachel stuck to some of the songs she performed during her four week tenure on the ITV talent show - U2's One and Robbie Williams' Let Me Entertain You at the gig at the Talk Talk Contact Centre in Birchwood.
Rachel, who controversially lost out to croaky-voiced Lloyd Daniels on Sunday's X Factor "sing-off", said she has no regrets about her experience on the show, and said she'll keep on watching and cheering on her pals.
"I love Joe [McElderry] so I want him to win," she told me.
"I think it will be Joe and Stacey [Solomon] in the final."
Rachel also confided that she was glad she stayed in the show long enough to meet a personal favourite of hers - rocker Jon Bon Jovi.
She giggles: "I really fancy him. I went up to him after the show and told him: `I think you're sexy'. He looked a bit shocked and said, `oh ok'."
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