Ewen has no definite plans to perform again with her bandmates Heidi Range and Amelle Berrabah, following the reunion of the trio's original line-up, Mutya Buena, Keisha Buchanan and Siobhan Donaghy.
She tells Digital Spy, "I don't even know if the band stuff is going to happen again, if I'm completely honest. I think Amelle wants to do her own solo stuff, Heidi is doing a Happy Days musical... I think we're pretty much done.
"I'm working on solo material at the moment actually. It's only come about in the past three weeks, so it's quite a new project. No one's really seen me yet... I've been in a band, but I don't think anyone really knows what I'm about."
Ewen, Range and Berrabah replaced Buena, Buchanan and Donaghy, who formed the Sugababes in 1999 but left to pursue solo careers. All three original members had abandoned the group by 2009, but they reunited as Mutya Keisha Siobhan last year (12).
Ewen insists she would love for all six women to team up on tour, insisting, "That would be awesome, it would sell out. That's easy for me to say, though, I don't know how that would go down (with the other girls). But I'm definitely up for it."