Active tb. History of tuberculosis.

Hello doctor, I had kept a maid to take care of my daughter who is 1 and a half years old.She was with her for three months taking care of her.One day the maid fell sick and coughed up blood once.After that I discontinued her services immediately.This episode is now two months old.I got the maid's sputum test done for tuberculosis which was negative.However on questioning her she told me that her father had died of tuberculosis 14 years ago.Other members in her family include two sisters,mother and one brother.I also got her digital xray done and a helical CT CHEST,both of which were normal.I want to ask of there is a chance that she may be suffering from active tuberculosis given her symptoms and family history of tuberculosis. Thanks