"I felt like I could do anything," she says. "Just being thrust into certain things by yourself. You have to grow. And sometimes it's good when you're separated, that you have that time to grow."
But Kelly adds that the time apart also made her realize exactly how much she missed the camaraderie of the group.
"Because sometimes you get on stage by [yourself] and you're like, 'Hey, I just forgot a word.' And then you [realize you] don't have the girls," Kelly says of singing solo. "So you have to really depend on yourself. I think you have that time to focus on what you need to pull up."