Welcome to HCM,
With little information you have given if she was taking Forcox for 3 months it is used for Tuberculosis
(TB) as commonly known as,If she has a Tuberculosis of Lungs then if it is open case then she can spread disease in intial part of treatment may be 2 months after which usually we test for sputum which becomes negative then there is no risk of spread.
What she told you and what test she is getting done , It is not clear from information you have given.
Please take care.