HI Thank for asking to HCM I really appreciate your concern for your daughter it is not the question of strong pain killer but underlying cause of ear pain is matter and this should be find out, anti- biotic wont work hear if the pain is due to the wax impaction then this is to be removed two conditions are very common for ear pain one is wax impaction and second is fungal infection and for that you have to see the ENT specialist or get done ear examination if your GP could do this, take care and have nice day.