Your gf seems like a bit of a gambler. Sure, the odds are in her favor, but why not just pay the fine and move on down the road?

Depending on the jurisdiction, ignoring fines, etc. can cause the amounts due and the consequences associated therewith to escalate rapidly. You note that the original fine was only around $100.

Not sure what she is hoping for here... the U.S. isn't the type of place where you can negotiate your fine without going in front of a judge (the time for which has long passed).