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This is Dr. David
I am sorry about your daughter.
if she has sinus congestion, she might have a bad bacterial sinus infection which can cause vertigo. antibiotic therapy would treat a bacterial sinus infection.
she could be having a bad migraine headache which can cause vertigo. migraine headache medication could help her. such as imitrex or topamax or maxalt.
I hope the emergency room doctors looked in her ears to check for fluid behind her ear drums which is a sign of inner ear infection.
does she have fluid behind her ear drums?
she she have sinus congestion?
she can go back to the ER today or tomorrow and ask for a 5 day course of migraine medications to see if that helps as an option.