"She was a giant in the gospel music industry," said Beckie Simmons, Rambo's agent. "Dolly Parton recorded some of her songs."
Parton sent condolences to "everyone involved in this terrible tragedy."
"I know Dottie is in heaven in the arms of God right now, but our earth angel will surely be missed," Parton said in a statement. "Dottie was a dear friend, a fellow singer, songwriter and entertainer, and as of late my duet singing partner."