Skin test symptoms and conditions

MY WIFE HAS BEEN ON PREDNISONE FOR 4 YEARS HER FOR FIRST SIGN OF ASTHMA SHE IS 25 NOW WE HAVE BEEN IN AND OUT OF THE HOSPITAL WITH NO INS. THEY TESTED HER FOR EVERY DISEASE AND FOUND NONE THE DOCTOR SAID THE BREATHING PROBLEMS ARE CAUSED FROM SEVERE ALERGIES WE CANT GET THE ALERGIE SKIN TEST DONE ON HER BACK BECAUSE THE DOCTOR SAID SHE HAS TO BE OFF THE DRUG WHEN SHE STOPS THIS DRUG HER ALERGIES CAUSES HER TO HAVE BAD ASTHMA AND BREATHING TREATMENTS DONT WORK WHEN SHE STOPS THIS DRUG SHE ALSO BRAKES OUT IN RASH AND IT TURNS INTO A BRUISES SHE CANT GET OFF THIS DRUG WE NEED HELP SHE IS A MOTHER OF 2 AND HAD A MISCARRIAGE 7 MONTHES AGO HOW CAN SHE STOP TAKEING THIS DRUG?