You mother has multiple problems and drugs for those and tuberculosis can really irritate your stomach and cause gastritis which may be causing your vomiting, but you are also advised to monitor your
liver function test as rising of liver enzymes can also cause this problem....
You have to give tuberculosis medications as per correct weight as too les or too much dose willl cause problems,hope it is government approved drugs and regimen and hope your mother has been registered for tuberculosis.
Next Steps
if your vomiting persists consult a gastroenterologist,she may require few injectable medications for her gastritis....