So when your mother will go for medical exam, they will ask her if she is on any medication. You should reveal everything truthfully around which all medications she take. What I will suggest is get her health check up done on your own before the medical test by IRCC. Test for things like Hba1c and Kidney function test, Lipid profile etc. Her Creatinine (Kidney function) should be fine, thats what IRCC also check. If Hba1c is higher than 9, I would say get that under control before that IRCC medical test (not just for Supervisa but for her own well being also). For medical Insurance i am not sure, but definitely take a good one