- MacKenzie's stepsister, Katelyn Salmont, who suffers from cystic fibrosis, guest-starred as Mackenzie's friend in the 7th Heaven (1996) episode "Back in the Saddle Again".
- Contributes her free time to animal charities
- She is actively involved in raising funds and awareness for the Cystic Fibrosis Foundation. Mackenzie's stepsister, Katelyn Salmont, lives with CF and, in 2005, Katelyn underwent a successful double lung-transplant. Both girls will be featured in Teen People's "20 Teens Who Will Change the World". 7th Heaven (1996) had produced a special episode about Cystic Fibrosis entitled "Back in the Saddle" which featured Katelyn as herself, and Mackenzie and Katelyn rode horses together, as they do at home. In 2005, 7th Heaven (1996) again brought Katelyn on the show, post-transplant, which gave her a chance to explain about the new life she had been given.
- Her first passion is horses, a family activity.
- Mackenzie's family of five includes her mom Donna, stepdad Randy, brother Chandler, and stepsister Katelyn; they raise a menagerie of dogs, cats, goats, chickens, and especially horses.
- Mackenzie's stepsister, Katelyn Salmont, passed away on December 25, 2008 from pneumonia and cystic fibrosis. She was 22 years old.
- Her ancestry includes English, German (including Alsatian German), Scottish, and Swedish. Her paternal great-grandfather, Eugene Leopold Rosman, Sr., was a German immigrant.
- Mackenzie is a Junior Ambassador for Childhelp Inc., an organization working for and with severely-abused children.
- Enjoys reading, skating, swimming, and dancing.
- Signed contract to appear in 7 episodes of 7th Heaven (1996)'s 11th season. (September 2006)
- Opted out of her contract to return for an 11th Season of 7th Heaven (1996) on the CW network. (June 2006)
- Filming episodes for the 10th Season of 7th Heaven (1996). (October 2005)
- Filming the final episodes of 7th Heaven (1996)'s 10th and final Season. (March 2006)
- Finishing filming for 7th Heaven (1996)'s 8th season. (February 2004)
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