How Can Tuberculosis Be Treated?

Hi my cousin suffering from TB and was taking medicines for last 6 months starting 2 months she was given 5 tablets after completion of 2 months we had seen a lot of improvement in her then when we again took her to doc and he reduced the tablets to 2 tablets after taking these for two months when she was examined her lungs xray shows no improvement and she lost 2 kg of weight also then doc has changed her tablets and given her Anti TB schedule 2 and she completed 1 month having this today but we are worried since having 4 months of medication there was no improvements in her reports are we following right treatment ?