To be honest, it is almost impossible and financially infeasible to get your mother to move to Canada permanently. There are certain conditions that need to be met in order to submit the application 1) Last three year returns- You need to show that you have been making a minimum amount of money in order to bear the additional expenses of your mother. The clock starts once you land, find a job and start paying taxes at this moment it is about 49K per annum if you want to sponsor one person. So considering that you land and immediately get a job that pays more than 49K, you'll have to wait 3 years before being eligible to apply for her PR. 2) Promise to bear expenses- The Canadian government gets you to promise that you will bear the sponsored person's expenses(incase they are not able to, which is the case with most old immigrants) for their first 20 years of stay in Canada, which can be in tens of thousands of dollars as they will not be covered under universal healthcare provided by Canada. Considering you mother's healthcare requirements would increase with age and exponential increase in your family expenses (having kids, bigger family, needing more resources) it would become financial infeasible very quickly even if you are able to support her initially.
Because of the high cost of healthcare support needed, immigrant families both in Canada and USA usually have some kind of visa for their parents to come visit from time to time them and pay for their living expenses and caregivers in the home country. A solution specifically for Canada, that a lot of people go for in a similar situation is a Super Visa. Super Visa lets the applicant live in Canada for 2 years continuously and is valid for 10 years.
P.S.: This post is not meant to discourage you, rather put the facts straight. Hope it is helpful to you and others in the same situation.
All the best!