Around my parts I would not call her lucky. I have heard that officers are encouraged to write traffic tickets under a local ordinance violation because more of the % of fine money is returned to the village where the offense occurred. I'm not sure if that is true or not, but most officers I know still write tickets under state laws.
Many officers have a choice when they cite people for violations of the law. They can cite under a local ordinance violation, or a state law. Many towns have adopted the Illinois Vehicle Code and have incorporated it into their local ordinances.
Sounds like your friend was cited for DUI under a local ordinance violation. In the area that I'm in, being charged with a local ordinance v. a state charge for DUI is not much better.
The Warning to Motorist(suspension of driver's license)still applies, big fines, lawyer fees, and car insurance jacked up. In the area that I'm in, the local ordinance DUIs and the state charged DUIs all go to the same courtroom to see the same judge. So, most of the time that means you get whatever the judge is giving out that day reguardless of state or local charges.
Oh ya, can not forget that the burden of proof for a local ordinace violation is lower than a state charge.
.243 or so, thats not just one too many. An expensive night out. IMO get a local lawyer that has done DUIs before in that area, and get the best plea agreement available.