Article continues below advertisementDolly Parton's sister Freida Parton is opening up about the country legend's health and reassuring fans that she's on the mend.Freida took to Facebook to share that she's been worried about her famous sister, who "hasn't been feeling her best lately" following the cancelation of her Las Vegas residency scheduled for December.Article continues below advertisement"Last night, I was up all night praying for my sister, Dolly," Freida wrote.