Which canadian companies are reliable and cheap for Mother's super visa medical insurance ?
Do they charge any cancellation or modification fees for date change, since at the time of buying the insurance it is a tentative date?
Reliable and cheap don’t go together when talking about medical insurance. Unless you have hundreds of thousands of dollars in savings I would consider more coverage versus less. There are a few examples in the past week where families have bills of 200k and 600k because they only had the minimum amount of insurance.
As above do not go cheap see this link where something that could happen to anyone has resulted in a massive ongoing bill. A good policy would also include medical repatriation to a home country if required something this family is possibly going to also be faced with given visitor status only lasts so long.