Hello Dr. Manjunath,
Thanks for coming to HCM. Sorry to hear about your mother's condition. Your description of her problems and test reports indicate that she has cancer of lung with possible extension (metastasis). Taking into consideration her age, her general condition and all other problems, your doctor has adviced palliative care
& treatment, which does not directly treat the main cause/disease but try to improve quality of life of the patient till she is alive. You can give her the adviced medicines and give her best possible general care at home. Simply keeping her admitted in hospital might not help her condition further and so she was sent home. You can always take second opinion
from other oncologist
and discuss other options.
Wish your mother better health.