Welcome to HCM
Thanks for asking query here
your mother in law is suffering from Bilateral extensive Tuberculosis
,as such also it's treatment is slow and takes long time but 10 months is long enough time to see improvement provided she has taken treatment regularly.Because once treatment is discontinued chances of TB becoming resistant to treatment are very high.
If there is no improvement in X ray
there is possibility Multi drug Reistant type of disease, a Sputum culture
and sensitivity may be asked to see the drugs she taking is working effectively. If resistance is there second line drugs may be used or added to the treatment.
You can see a Chest Physician /Pumonologist and explore if she needs a CT Scan
Chest to rule out any rare possibilities?Any immunocompromised reson exist.
Another possibility she has fibrosis
and very little kung tissue is there.
Give her good nutrition and take care of her .
Hope she recovers soon