The 17-year-old Australian conservationist opened up about the late wildlife expert, aka the "Crocodile Hunter," in an interview for the publication's Nov. 9 issue.
"You are forever a different person," the teenager said. "Dad was the strongest person I've ever known. And when the strongest person is taken away, you kind of go, 'Oh my goodness. What are we going to do?'"
Steve Irwin was killed after being pierced by a stingray barb at age 44 in September 2006. The television personality was also survived by wife Terri Irwin and Robert Irwin, and Irwin said the experience brought her family closer together.
"As a family, we've gotten so close," she shared. "The three of us, no matter where we are in the world, we'll always stick together. We can count on each other on the good days and bad days ... I know I can always just lean on them and know that I have their love and support."
Irwin's mom and brother temporarily moved to Los Angeles to be with her while she competes on Season 21 to "Dancing with the Stars."
The conservationist honored her dad with a contemporary routine to "Every Breath You Take" on the show's Oct. 5 episode.
Copyright 2015 United Press International, Inc. (UPI). Any reproduction, republication, redistribution and/or modification of any UPI content is expressly prohibited without UPI's prior written consent.