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It might have to do with her continued hearing loss. If she's having more trouble with that now than years back when it wasn't as bad, she probably wants to be more careful with her singing techniques. She might be struggling to adapt her singing to her worsening hearing and this might be why she doesn't seem as confident as before. Some people want more emotion from her and other people want her to focus on singing well, and it might be harder for her to achieve both at the same time now.
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