"Affluenza" boy got popped down in Mexico because he or his doting Mommy used a cell phone to order a pizza. That revealed their location to authorities. They're so stupid that it never occurred to them that U.S. authorities might monitor their phone traffic. Once they made the call, Marshals were able to tip Mexican cops to their location.
In the Mexican mugshot, Mommy exudes confidence. Nothing's going to happen to her - or so she seems to believe. Laws and other lives don't seem to matter to members of this deranged family.
Apparently, Mommy's unaware of the fact that she's now facing third-degree felony charges and is looking at two to ten years in prison if convicted. There doesn't seem to be any way that she can evade conviction, and with any luck she'll get the maximum sentence.