I can understand your concern.
SLE is an autoimmune disease
in which one's own antibodies react against one's body, affecting many body organs, including the bone marrow. This may cause several blood cell types to be depleted, and it explains the "nil" WBC and platelets. Having said that, it's curious that the RBCs are relatively spared this severe depletion. A bone marrow test is indicated, to determine the extent of bone marrow affectation.
Unfortunately, transfusion of blood does not usually help, as the new blood cells are usually destroyed. This is why most experts would rather try to "mop-up" the abnormal antibodies, using plasmapheresis, steroids, and other immunosuppressive (agents that act against the immune system) drugs. From what you have said, it appears things are being done to keep the disease in check. Some patients with severe disease may benefit from Hematopoietic Stem Cell Transplantation
If you want to consider a second opinion
, I would suggest you seek out an Hematologist
, Clinical Immunologist or HSCT Physician.
I wish your wife quick recovery.