Speaking at a press conference to promote their upcoming film Seeing Double, she added: "I think when the time comes it will be because we have decided we want to move on and do different things.
"But at the moment everything is cool and we are really happy."
In Seeing Double, S Club take on an evil genius who has made clones of them.
"I have my good days and my painful days but I'm still smiling", she said after hobbling into the press conference.
The group said they stay in touch with Paul, who quit the band to go back to nu-metal style group he was in before S Club hit the big time.
Bradley said that Paul - who goes out with ex-band mate Hannah - often dropped into rehearsals to see his old pals.
Pop Idol loser Gareth Gates makes a guest appearance in Seeing Double and Rachel gets to smooch with him.
She says her boyfriend, Casualty star Jeremy Edwards, wasn't bothered about the scene: "He was cool with it. We didn't do a full on kiss."
Rachel did have to kiss Bradley though, something they both found embarrassing, and despite Bradley's cool image, Rachel wasn't impressed.
"I'd give him six out of 10," she laughed.