This sounds like a 1543(b). If your fiance was indeed charged with a 1543(b), I would recommend that he/she attempt to plead down to 1543(a). Although, this outcome will yield a license suspension of 1-year, the fine is smaller and there's no mandatory jail sentence.
However, I suggest that you speak to a lawyer first. Based on the facts and some mitigating factors, your attorney may even be able to dismiss the charges.