Her actions exactly fit the very definition of smuggling.
1 : to import or export secretly contrary to the law and especially without paying duties imposed by law 2 : to convey or introduce surreptitiously
intransitive verb
: to import or export something in violation of the customs
She purposely under reported the value to save $4,100. Not very different from her hermanos and hermanas sneaking across the border and working with stolen SS numbers.