My Black Lab Seems To Have A Fever, Won't Drink Or Eat, Is Shaking And Having Trouble Walking. What Is Wrong With Her?

Macadamia nuts are toxic to dogs.  This toxicity is acute (occurs rapidly) and is self-limiting.  Most dogs will have signs within 12 hours of ingestion. And usually these resolve within 24-48 hours (once the nuts have passed out of the gastrointestinal tract).  Signs include hind limb weakness, depression, vomiting, ataxia (wobbling or walking drunk), tremoring, fever, and abdominal pain. 
Treatment includes inducing emesis (vomiting) if not already occurring to remove any more nuts from stomach.  Activated charcoal (not grilling charcoal) can be given by your veterinarian; this will bind the nuts and help pass them through.  Supportive care--intravenous fluids or thermoregulation--is given if dehydration or hyperthermia becomes severe. 
Since you are unsure if your dog ate any other plants or toxins have her examined by a veterinarian.