She can afford a round trip ticket, bought at the airport on the day of departure. Or fled across the Mexico border. Or smuggled herself out on a boat. There are SO MANY ways to flee the country that are not shouting "HEY FYI TO THE JUSTICE DEPARTMENT — I'M LEAVING FOR A BIT".
Facing 11 years of it after being a part of the 1% can lead to some pretty human, pretty stupid decisions.
She isn't some hardened street criminal with a "Go bag".
> Prosecutors had attempted to argue that Holmes did pose a flight risk, revealing that her partner had bought her a one-way flight to Mexico shortly before the verdict was returned. While Davila called the travel plans a “bold move” and Holmes’s failure to cancel the ticket post-conviction a “perilously careless oversight”, he accepted her assertion that she was not trying to flee the country.