If found mercury in the blood, its serious, in the hair, not reliable at all.( the hair test). And it will be needed with a anamnesis, and removal slowly of fillings,not more than two pr month if she can tolerate it, and cofferdams etc must be used by the dentist, by her, one alcaholic drink 10 min before removal, along with two charcoaltablets, this will hinder exstra contamination of mercury.