sentences:  According to an announcement on their official website, "[Buena]'s decision was based purely on personal reasons and she will continue to remain the best of friends with both [Buchanan] and [Range]".Buena later stated in an interview that she was suffering from postnatal depression after the birth of her daughter combined with the group's increasingly hectic schedules, and chose to leave to spend more time with her daughter.The last remaining original member, Buchanan, said upon Buena's departure, "...we will all miss Mutya, but we also knew there was still a place for bringing in somebody new who could help us carry on taking the Sugababes brand of music forward".