Married in foreign country without divorcing in india

The foreign judgement is valid in india as per law, so no divorce is necessary in indian court, keep the divorce decree  for evidence.

Since she married in Canada as per Canadian laws after Canadian law divorce, her marriage may be considered as legally valid, besides you never contested the divorce granted by Canadian court anytime so far which clealy indicates that you accepted the Canadian divorce especially while youe marriage was once again registered as per Canadian laws, hence you have no case to get her subsequent  marriage nullified for any reason.