ur wife will undergo additional test to confirm if she has TB.Sputum test,and maybe one that will require culturing specimen from your wife just to prove accurate diagnosis.a scar on the lung might warrant 6 months of medication even if test results are negative for TB.

i don't know the rules now,before...as long as you sponsored her,she stays here and undergoes treatment.i heard they are more strict now.if she indeed has TB,it will be difficult for her to find a job.The TB clinic where they will refer you can give you advise whether your wife can work or not.