The 21-year-old singer - who joined the ever-changing girl band last year after Keisha Buchanan was ousted from the group - admitted her pop star ambitions were floundering before she got the opportunity.
She said: "I did wonder what I would be getting into, yes. My career wasn't exactly taking off, was it? I needed an opportunity."
Heidi admits she and Amelle didn't know much about Jade before she was drafted into the girl group.
She said: "We'd heard of Jade, of course, and we knew that she had this fantastic voice... but we'd never met the girl before, so we didn't really know her."