The X Factor singer-songwriter was asked what she would do if her group are booted out of the show.
"I'm a songwriter and was asked to write for Fazer but I had to say no because of X Factor," Charlie told Now.
Of how the group felt about getting Louis Walsh as a mentor, her bandmate Simeon Dixon added: "At first, it knocked me off balance a little bit, but then I began to see the benefits of it, with his experience and what he's done for JLS."
Asked who their favourite judge is, Simeon said: "We have to say Louis, but Tulisa understands us, I think."
Asked if MK1 can win the show, Charlie said: "It depends on which demographic watches it. If underground people do, then we have a chance."
Read the full feature in Now magazine, out today (October 2).