i am sorry that your mother is suffering from many disease.
anti TB drugs usually takes 1-2 week to response like sense of well being, temperature return to normal,weight gain,appetite increases.
if symptoms persist after 2 weeks then there are some possibilities like wrong diagnosis,MDR-TB etc.
in that case,you have to wait for 2 months for response.
after 2 months, sputum culture
& drug susceptibility test should be done.
you have to consult a chest specialist.