Last year I had Labryinthitis. It is an infection of the inner ear and causes dizziness, vomiting etc. I was petrified, I turned over in bed and the whole room started spinning in circles, it was very frightening until I saw the doctor, they gave me some tablets to help with the dizziness, couldn't cure it as just a bug, took about 3 weeks to go. I couldn't drive and had to be really careful just walking around, the worst dizziness was turning over in bed though, was horrid. Anyway if it could be that take her to docs as they can help symptons.