Its not likely a stroke though what I suspect, vestibular disease, can look a lot like that.
You can read about the inner ear issue vestibular disease here
http://www.marvistavet.com/html/body_vestibular_disease.html
Its like really bad motion sickness and can make a dog as wobbly as if she is drunk and make the eyes move back and forth and cause the dog to vomit.
If she could have gotten into anything toxic, or really can't hold anything down, you may want to see your vet. Toxin ingestion can be treated even if its just with supportive care but if its vestibular disease an antinausea shot, some meds to help reduce inflammation may help this all pass more rapidly.
Vascular accidents in the brain are less likely in the dog and you can read about them here
http://www.marvistavet.net/html/vascular_accident_in_the_brain.html
Hope this helps you!
Dog Expert:Rescue, Train,Breed,Care
30+ yrs dog home vet care & nursing, rescue, behavior&training, responsible show breeding, genetics