The woman killed when a deranged white supremacist drove his car into a crowd of anti-hate protesters in Virginia was a born do-gooder — and the apple of her father’s eye, the grieving dad told The Post on Sunday.

“She was my only daughter — she was my heart,” said a stricken Mark Heyer, struggling to find the words to describe his daughter, Heather Heyer, 32.

The dad, who lives in Florida, said his “baby girl,” a Charlottesville paralegal, was a social-justice warrior who ended up making the ultimate sacrifice for her beliefs.

Heather Heyer’s Facebook cover photo, posted about a week after the 2016 presidential election, said, “If you’re not outraged, you’re not paying attention.”

“My daughter was fighting for equal rights, demonstrating against hatred and doing what she thought was right,” Mark Heyer said. “She ended up dying to prove it.

“I’m not ready for all this,’’ the dad added, his voice breaking. “I’m still working around the fact that my baby girl got killed.’’

Heyer was protesting so-called “Unite the Right” white-supremacists who had assembled in a Charlottesville park to decry the planned removal of a Confederate statue there.

She was mowed down by Nazi sympathizer James Alex Fields Jr., who allegedly plowed a Dodge Challenger through a pack of anti-racism protesters, injuring 19 other people.

Nine of the victims have been released from the hospital, and 10 others are in good condition, said a spokeswoman for the University of Virginia Health System in a statement Sunday

Fields is set to be arraigned on murder and other charges in Charlottesville Monday. He will appear for the hearing by video because of concerns that someone might try to assassinate him if he’s brought to the courthouse, a local police source told The Post.

“Threats have been made, and they’re being taken seriously,” the cop said.

Meanwhile, in other developments Sunday:

Heather Heyer was a native of Greene County, Va., and graduated from William Monroe High School in Stanardsville, according to a GoFundMe page started by her friend Felicia Venita Correa. It had raised more than $200,000 by Sunday afternoon.

Heather worked as a paralegal in the bankruptcy department at the Miller Law Group in Charlottesville, according to the firm’s Web site.

Another Heyer friend, Marissa Blair, said they went to the anti-racism rally because “we had been witnessing everything that was going on.”

“We couldn’t have hate groups walking around our city with no peaceful opposition,” Blair told the DailyMail.com.

Heather’s mother, Susan Bro, told the Huffington Post that her daughter “always had a very strong sense of right and wrong, she always — even as a child — was very caught up in what she believed to be fair.

“Somehow I almost feel that this is what she was born to be, is a focal point for change. I’m proud that what she was doing was peaceful,” the mom said.

As for Fields, “he has now ruined his life as well as robbed a great many of us of someone we love very much. No mother wants to lose a child.

“But I’m proud of her,’’ she said of her daughter. “I’m proud of what she did.”

Heather’s dad said his daughter’s campaign against hate is inspiring him to forgive Fields despite the horrible atrocity.

“I can’t hate the man who did this to her because that would make me as bad as the people who did this,” he said.

“As far as I’m concerned, he was deceived by the devil.”