The 25-year-old has been on the verge of releasing the follow-up to 2009 debut Do You Want the Truth or Something Beautiful?' since last October, but explained that it is a slow process.
She commented: "The album's not finished yet and I'm not sure when it will be. If I had my way it would be out tomorrow, but there are so many other people involved that nothing happens quickly.
"If you're in a band in this business you can group together and make things happen or stand up for what you really believe in. When you're on your own it's much harder. I suppose you have to be hard-nosed.
"I'm not afraid to say what I think, but I tend to back down too often."
The 'New York' singer also admitted that being signed to major record label Epic makes her feel under pressure to be instantly successful.
She added: "We all have to bend sometimes. Epic backed the release of the album's title track which wasn't an obvious single, but you definitely have the feeling there's less time to prove yourself or develop as an artist than you might have on an independent label.
"Kings of Leon were on their third album before things really took off, but, you know, that's just the way things are."