I don't know the details about OHIP. But if your mother entered with a regular visitor visa (not super visa), the default stay is 6 months (not 1 year).We went to Service Ontario location and they turned us away by saying that they need to see PR document from IRCC, they just can't let my mom giving a health card by seeing IRCC is ready to finalize the status. We are back to square one, uploaded photos on PR portal on March 2nd 2022 and PR portal status still remain - In review with IRCC. The medical was done on July 11th 2021 which means we have to do it again as it is only valid for 1 year. They are not answering anything on phone, on web messages and we are just stuck here. Anyone else can share their experience as to how long should it take once photos uploaded and address in Canada confirmed on PR portal. I am getting anxious for my mother as I really do not want her to leave Canada but as a visitor she can only stay for maximum of 1 year.
You can apply to extend her stay as visitor before the 6 months time is up.