In some states refusing a breathalyzer can get you in more trouble than the actual DUI. I'm pretty sure in my state it's an auto 90 day license suspension and carries its own fines/penalties. If she wasn't under the influence then she's a damn fool for not taking the test. However I've heard lots of people talk about declining it if you are borderline and think you can test lower by the time you get the station--maybe that's what she was thinking?
she apparently wasn't clued in that if you refuse a breathalyzer then you immediately go to jail aka arrested.
there's another reason to refuse it...(other than hoping your alcohol level goes down) but i can't remember what it is... but i remember being told you SHOULD refuse it.