Six y/o daughter headache so bad it brought her to tears, sound making her ears hurt, eyes were out of focus, very tired, she vomited. migrain?

Any fever: Might represent an infection, in particular an otitis. Needs to see your pediatrician.

Maybe,maybe not: An acute headache of such amplitude that disappears in an hour or so with sleep or other interventions may be a migraine in a 6yo. If it lasts hours or more there is sometimes an infection as a trigger. Lack of sleep, fasting, poor hydration, stress and illness are common triggers.