Call the Service Ontario hotline and they will help you with the vaccine certificate if your mother only has the red and white health card. You already would have the vaccine certificate for your mother if you didn't waste your time asking question on an unimportant internet forum.
https://news.ontario.ca/en/backgrounder/1000806/using-your-vaccination-receipt-frequently-asked-questions
Identification documents that may be used as proof of identification include:
She certainly has her health card, right?
Call the Service Ontario hotline and they will help you with the vaccine certificate if your mother only has the red and white health card. You already would have the vaccine certificate for your mother if you didn't waste your time asking question on an unimportant internet forum.