She has been singing and touring every year practicaly since 1999, she hasn't take a break almost in these 18 years of career, its normal that her voice is not the same as before, she should rest for a while tbh, I'm surprised she still sounds great live (not that great as before but I still think she does) there are other singers that with a lot of rest and breaks between albums and tours they still lose their voices or sound awful live, if she took a year or two to rest I'm sure her voice would sound fantastic!
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