B..
Did they get a white count? Does it show infection? Is it just fluid behind the ear causing pain? They can give you drops to put in her ear to numb the pain. If it goes away, I'd say it fluid behind her ear.
It could be her mastoid bone beside her ear/jaw. A mastoiditis is painful.
She would have a high white count.
I would need a referral to a ear, nose and throat doctor.
I'm not a doctor. Just a mom, too.