Aniston stopped speaking to Dow after her mom wrote the tell-all book, From Mother and Daughter to Friends: A Memoir, in 1999.
She explained that she didn't come out the model child that her mom had hoped for and that they had a hard relationship.
'This little girl just wanting to be loved by a mum that was too occupied with things that didn't quite matter.
"She was critical. She was very critical of me", Jennifer said at the time. I was not. I never was.
In "Dumplin'", Jennifer Aniston plays Rosie Dickson, a former beauty pageant queen whose plus-size daughter, Willowdean (played by Danielle Macdonald), signs up for a beauty contest amid a struggle with body image and self-esteem.
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She continued: "I honestly still don't think of myself in that sort of light, which is fine".
Dow, who acted in shows like The Beverly Hillbillies and The Wild Wild West, was married to Jack Melick from 1956 to 1961 and Aniston's father, soapstar John Aniston, from 1965 to 1980.
Nancy Dow, based on Aniston's description of her, was clearly preoccupied with her daughter's appearance.
She also revealed that there were some years that the two didn't speak, due to her mother's temper, which the actress simply couldn't tolerate.
Dow passed away in 2016 at age 79. "I've had moments where I've felt terrible and I didn't feel good enough or pretty enough or anything enough", she added. It didn't seem like the actress wanted to forgive her mother, because she didn't even invite her mother to her wedding with Brad Pitt.
A source close to the Aniston family told People at the time, "No matter how complicated and hard the relationship between Nancy and Jennifer may have been, it is heartbreaking for any daughter to lose her mother".