Where in Arkansas did this occur?
First, does she have any legal defense to the charge? If so, she should immediately hire a lawyer and enter a not guilty plea.
Otherwise, if her driving record is presently clear, typically the prosecuting attorney for most jurisdictions will take these "under advisement", meaning she pays the fine, pays the court costs, takes an approved defensive driving course, and if she has no other offenses within a specified time, usually six months, the ticket will be dismissed and not appear on her driving record.
66 in a 40 may, or may not, make it tougher. Sometimes they want the cops concurrence. The bigger the ticket, the more likely that becomes.