She should hire a good lawyer to ensure that her rights are protected and the case is properly defended. They will likely have a hard time proving DUI if breath and blood are clean, but I have seen officers try to argue that she was impaired by a drug that the blood test does not screen for. I think that is a bogus argument, but again I've seen it happen.
Unfortunately, she can be convicted upon the officer's testimony alone. More regrettably, if a pre-lim is on the docket for Monday, that implies that the DA's office is actually going to push this.
She needs to retain a skilled DUI attorney that can get this thrown out for lack of probable cause. If it isn't, her case will be bound over to the Grand Jury wherein she will be indicted. Then, it goes to Circuit Court.
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