As a member of the family, her shares of Mars, Inc. and other assets were estimated by Forbes magazine in April 2024 to be worth $38.5 billion, making her the 19th richest American, and #34 on its list of "The World's Billionaires".
[7] In June 2019, Forbes listed her as the wealthiest resident living in Virginia, with an estimated $28.1 billion net worth.
[13][14][15] On October 4, 2013, at the age of 74, Mars was involved in a car crash on U.S. Route 50 in Aldie, near her home in The Plains in Northern Virginia.
[18][19] Mars subsequently pleaded guilty to the misdemeanor charge of reckless driving, with tests having revealed no drugs, alcohol, or medications in her system that could have caused a blackout.
[21] Mars also sits on the National Advisory Council of the Journey through Hallowed Ground, a foundation promoting American heritage in the region stretching from Gettysburg, Pennsylvania to Monticello, the home of Thomas Jefferson that is situated just outside Charlottesville, Virginia.
[7][13] In 2021, she made a $1.25 million donation to help house "Angels Unawares", a sculpture by Timothy Schmalz, at The Catholic University of America.