Some thoughts...
A few of the above posts have some information that may or may not be erroneous, depending upon the state and other factors.
-Many states immediately suspend your driver license when you are initially pulled over and/or arrested, and will remain so until either the case is settled or the term of the suspension is run out (usually 180 days). Even if you plead guilty to a lesser charge, the record of the alcohol-related license suspension will stay and will be reported to the NDR. Trust me, I know.
-The FAA WILL, and I mean WILL find anything on the NDR. Their checking it is not simply a "can do" it's a "will do", and eventually they will find it. Simply not reporting it is the worst thing you can do.
-I believe you will find that the period of time in which the FAA requires you to report any motor vehicle actions is 60 days, not 90 days. My recollection at least.
-As for the NDR, it's my understanding that all midemeanor traffic charges will make it to the report... And that would include Reckless Driving. DWI/DUI, vehicular manslaughter, vehicular homicide, all that good stuff will also make it.
This much I have learned in my looking this stuff up, since I too have a friend that was arrested for a DUI (and by "friend", I of course mean ME... Hee hee hee). The upside of my situation is that I, I mean MY FRIEND, wasn't convicted of the charge and still managed to get not one but THREE airline jobs anyway. Yes, it has cost me a job or two, I think, as the glazed look that comes over an interviewer's face when this topic comes up is unmistakable... But the further away the incident gets without any repeat performances makes it matter less and less. If your friend can get the "whoops it's been three years and I haven't reported it" thing taken care of, she will find that after five years from the incident, noone really cares anymore. Once it is TEN years you don't even have to report it on most major airline applications.
Just make sure that a lesson was learned and it doesn't happen again. I know an individual that managed to beat a DWI rap (which was way more serious than MINE), yet subsequent to that wrecked his car in another DWI incident that he ALSO managed to get away with... Yet I watched him knock back more beers than he should've and drive after all that had happened. Don't be the person that the law was mean to protect us all from. Once is once, but if it happens again, maybe you need to rethink both your career choice AND your ability to learn from your own mistakes. In the worst case, the law of the land or the law of averages will help make this decision FOR you.
My $.02.