Great, As far as I know, They expect you to be working while sponsor her and able to take care of her and not on any social assistance. EI and Current CERB are fine as they mentioned. That's why they ask for Notice of Assessments(Tax Returns in Canada Proof) and Letter from your employer in the Default checklist. If not, you have to provide explanation and other proofs. Also no time restrictions to sponsor unless you are sponsored by some other family member in last five years or something. Not sure if there is an other option, never thought of it!
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5. Employment/Source of Income - Do not complete this section if you are a Quebec resident.
You need to show that you can support the person(s) you are sponsoring. Provide documents from one of the following options:
If you are working in Canada, provide an original letter from your current employer stating your period of employment, salary, and regular hours per week or supporting financial documents if you are self-employed AND one of these documents issued by the Canada Revenue Agency (CRA):
• Your most recent Notice of Assessment. This must include line 150 (Total Income), or
• Proof of income statement (Option C).
Note: You can view (and print) your tax retum(s) as well as other personal tax information using the CRA's My Account online service.
To register or login, visit
https://www.canada.ca/en/revenue-agency/services/e-services/e-services-individuals/account
individuals,html.
If you cannot provide a Notice of Assessment or a proof of income statement (Option C) for the most recent taxation year, you must provide an explanation on a separate sheet of paper, accompanied by relevant supporting financial documentation to show how you can support the person(s) you are sponsoring.
If you are not working in Canada, provide other documentation showing that you can support the person(s) you are sponsoring. This must include a detailed explanation of how you plan to support yourself and the sponsored person(s) on a separate piece of paper.