Dolly Parton 's sister is asking for prayers for the singer amid "health challenges" that forced the superstar to postpone her upcoming concerts .

"Last night, I was up all night praying for my sister, Dolly," Freida Parton wrote in an Oct. 7 Facebook post . "Many of you know she hasn’t been feeling her best lately. 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."

The post concluded, "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. We all love you! ❤️"

USA TODAY has reached out to Dolly Parton's rep for comment.

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