Thank you for your query.
I presume that you mean that your sister is losing weight when you say that she is going weak to weak. What is her haemoglobin
If your sister is losing weight then she needs to be reviewed by the doctors to determine if the tuberculosis
has not flared up again. In case she is getting pale then the results of the haemoglobin should guide your doctor to the correct course of management.
I hope I have answered your query to your satisfaction.
Wishing your sister an early recovery.
Rajiv K Khandelwal