Allergy to crown cement

Doctor,
My daughter is 7 years old and has some failing adult teeth. She was given crowns under anesthesia yesterday and has severe swelling and a fever this morning. The dentist saw her again and claims that she is having a rare allergy to the cement used in the crowns. He also said that the options are to put her under again and redo the crowns or have her wait it out until her gums heal from the allergy. His recommendation is to have her wait and give her pain medication to make her comfortable. I am seeking a second opion as I am concerned about the validity of the diagnosis and the recommended treatment (or lack thereof). Any information is greatly appreciated!!

[Jerome Tsang, DDS]

I would seek a second opinion on the matter just in case.  

I'm not sure what type of cement he used on her crowns.  As far as I know and looking up the California Dental Board Material Safety Fact Sheet, there are no known documented allergies to cements.  There are documented allergies to metals used in crowns though so she may be allergic to the metal in the crown.