Your mother seems to have intolerance to metformin- the drug in the tablets Gemer or Gluconorm
G 4 forte. Hence the vomitting is happening.
For change in her medication, you need to tell me if your mother is overweight
, if she or anybody in her family side have heart disease
, if she has any complications related to diabetes, if she is aware of hypoglycemia
when she gets it, if she has any known gastritis
If you can take her to a nearby physician he/ she should help you in changing the medications and also in putting her on temporary insulin treatment just for the sake of high sugar readings and intolerance to oral drugs.
Make sure to show her to a good physician without delay as she has very high sugars. Take care and all the best.