Dolly Parton's sister has asked for prayers as the country music legend continues to recover from recent health problems. Freida Parton, one of Dolly's five sisters, posted to Facebook that she has been praying for her sister, and implored others to join her. "Many of you know she hasn't been feeling her best lately," the singer, songwriter and musician said. "I truly believe in the power of prayer, and I have been led to ask all of the world that loves her to be prayer warriors and pray with me." Dolly postponed her first Las Vegas residency in more than 30 years late last month, saying she was dealing with health challenges. In her statement, she joked, "It must be time for my 100,000-mile check-up, although it's not the usual trip to see my plastic surgeon!" Prior to that, Dolly also missed the announcement of the latest ride at her theme park, Dollywood. Freida did not detail exactly what health concerns the singer may be facing, but Dolly has shared elsewhere that she has had an issue with kidney stones. "She's strong, she's loved, and with all the prayers being lifted for her, I know in my heart she's going to be just fine. Godspeed, my sissy Dolly," Freida concluded. "We all love you!"