In medicine, there can be no guarantees that someone will be all right after 1.5 years. In fact, I doubt if you can guarantee that you will be all right after 1 year.
TB used to be considered a bad disease earlier when there was no cure. But currently, with the treatment and medical care available today, it is far preferable to some of the alternative diagnoses that may be more dangerous.
The anti-TB medicines that she is taking may have side effects. You could avoid conception till she completes the treatment. I suggest that you confront your issues by personally consulting the doctor who is treating your friend.