It is rumoured that Cyrus, 21, uses Parton's connection to get benefits, reported Showbizspy.
"Dolly really took Miley under her wing and told her from the time she was a toddler to chase every dream that comes into her head. Dolly was there every step of the way as Miley's career exploded," a source said.
"Miley doesn't seem to pay much attention to Dolly these days one way or another. It breaks Dolly's heart because she used to consider Miley the daughter she never had - but Miley only plays the 'Dolly is my godmother' card when it benefits her," the source added.