CIC describes it here: http://www.cic.gc.ca/english/visit/letter.asp
If you're talking about the supporting documents from your side, your proof of status in Canada is all that's needed. Your financials aren't as important as hers. If you're referring to the documents for the entire TRV application, you both can check here: http://www.cic.gc.ca/english/information/applications/visa.asp