What you need is to apply for Parents/Grandparents sponsorship so that you can sponsor your mom to be Permanent Resident. In order to do this, you would need the followings:
First, you need to check if your total income is enough to sponsor your parents. The required incomes are varied based on your family size at the time you submit the application. IRCC will need to see your qualified 3-year consecutively incomes before your application. For example, if you plan to apply for sponsorship for your mom in 2019, you must have qualified income for 2016-2017-2018.
Secondly, you will need submit the "Express of Interest" to sponsor for your parents. This is done via online form submission. The online form will be available from IRCC website approximately from January 2, 2019 until February 1, 2019 (1 month)
IRCC will select 10,000 people who submit the express of interest and will invite them to apply for sponsorship
All of the above are explained in details via IRCC website, here:
https://www.canada.ca/en/immigration-refugees-citizenship/services/immigrate-canada/family-sponsorship/sponsor-parents-grandparents.html
Good luck