some people react to anti Tb drugs at the start but get used to with time. Fever
might persist even up tothree weeks with the drugs. However, its advisable she sees a physician to rule out other causes for why she really fainted. The fact that she was not eating could cause to fall.
Other causes of weakness or coinfections should also be sought,
While waiting, she should drink much water, take her drugs as recommended, eat lots of fruits and see the primary care
physician for reevaluation and manaement.
Hope this helps,