Harley Quinn Smith is opening up about helping her father,Kevin Smith, after he suffered his massive heart attack in 2018.

The actress, 20, who stars in Quentin Tarantino’sOnce Upon a Time in Hollywood, spoke to PEOPLE at San Diego Comic-Con while promoting the film.

“Once he had his heart attack, I made him go vegan,” she said. “That wasn’t so much advice, as it was, ‘You have to do this.’ I didn’t really give him a choice. There was no way that was not going to happen.”

Kevin, 48, suffered what is called The Widowmaker and lost 51 pounds to regain control of his health.

“Going vegan isn’t hard, but it’s definitely something you have to get used to, being super aware,” Harley said of her father’s lifestyle change. “I’ve helped him through it, I’ve held his hand. It’s much easier to go through it when you have somebody.”

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Kevin Smith and Harley Quinn Smith

She continued, “When I went vegan, my best friend went vegan right before me, so she held my hand, and now I’m holding my dad’s hand for it. I’m really happy I get to be there for him for this.”

Kevin told PEOPLE at the Los Angeles premiere ofOnce Upon a Time in Hollywoodthat he “never imagined I would go vegan,” but the diet is working for him despite “f—ing hat[ing] vegetables.”

Harley is also starring in her father’s upcomingJay and Silent Bob Reboot, alongside a slew of Hollywood stars such asBen Affleck, Matt Damon, Jason Lee, Frankie Shaw and Shannon Elizabeth.

Their bond has helped Harley take on her own projects as well, such as her band, the tenth, and her directorial debut for their upcoming music video.

“He gives me advice on all fronts. I think we keep each other in check a lot for sure,” Harley said. “We’re really, really similar people, and we feel things really similarly. When one of us is really going through something, or really emotional, the other one knows exactly what to do, because we experience the same feelings.”

She added, “We always keep each other in check, or are always there for each other when something gets rough.”

Harley stars as Froggie, one of the Manson Family members opposite Dakota Fanning, Lena Dunham, Margaret Qualley and Austin Butler.

Once Upon a Time in Hollywoodis in theaters now.

source: people.com