It's also interesting to note that she wasn't thin in late 2014, but her confidence was through the roof because her vocals were on fire. So her confidence also depends on the state of her voice. Although it's improved for weeks, I personally don't think she's been sounding amazing lately, not saying that she's sounding like s*** but she's for sure capable of much better.
She had slimmed down a lot for Beacon 14. I don't think she was mega confident looking on the TECS tour despite the improvement in her voice.
I honestly do think her confidence on stage relates to her weight and issues in her personal life more than anything else. I mean we've seen her with confidence lipping for her life like at the Grammys 06. She had plenty confidence in 08 before she got married and became a zombie yet her voice was shot.
I just think it depends on a lot of things. I actually do think she has confidence in her voice at the moment. She's sounding very strong even if her tone isn't as clear as it was last year. She has plenty power and she can rely on her voice. She's standing up to the mic and she's delivering. But her problem is the fact she's so corseted up in those dresses that it makes her appear super stiff.
But it's a vicious circle cause the chances are she might have taken steroids to get her voice in shape which causes weight gain. Who knows what's going on with her though but her voice certainly isn't a concern for me at the moment.