what could be cure for this type of allergy

My wife has a strange type of allergy. She has the from her birth time, she can't take milk because of calcium and not only milk whatever is made from milk, yogurt, cream, cheese and much more. It's not only milk but also citrus stuff like strawberries, lemons all the stuff that has vitamin C. Can someone tell me what could be a permanent cure for this as she can't eat anything that she likes and what is the name of this problem?
Source: Student Doctor Network Forums - Category: Universities & Medical Training Authors: Tags: Europe Source Type: forums