Hello
As you stated in the query that your mother took complete anti tubercular treatment more than required .
She stopped that treatment and after this still ,she is having a fever 99-101 F .
Such type of fever may be due to these reasons , these include:
1
Anemia ,as this is most common cause after the treatment ,so get in blood examination for
hemoglobin level.
2 Failure of treatment , diagnosis can be confirmed by X ray chest and note down if fresh lesion ( cavities ) present or not present.
Some times due to resistant bacilli, patient don't respond to treatment .
Also get in blood examination for C B C and E S R ( if very high i.e. 100 mm of 1st hour ,highly suggestive of chronic infection or failure of treatment.
3
Typhoid fever also ,if untreated may develop such type of fever , so get in blood examination for
Widal test , as well serology test .
However , there are so many other possibilities of such fever , like cancer ,
jaundice but I recommend you , please consult another physician and get his 2nd opinion.
Good luck.