In the given case, the employee contented that her punishment was unconstitutional. In such situation; Yes, the appellate court should vacate her sentence because "the imposition of a fine violated the Due Process Clause of the Fourteenth Amendment".
Prior to taking away someone's "life, liberty, or property," the government must provide "due process of law," according to the Due Process Clause. Alternatively said, the Clause only mandates that the government adhere to; it does not forbid the government from denying someone of "substantive" rights like life, liberty, or property.
Reason for the violation of due process clause is-
To know more about the the due process clauses in the Fifth and Fourteenth amendments, here
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