"Dual intent" is when a foreigner enters Canada to be sponsored but with the intention of leaving Canada if the sponsorship application is refused. It is a really touchy and risky - I don't know what the success percentage is - and happens with people who are either ineligible for a visa or already have a visa. Maybe I'm misinformed but, to the best of my knowledge, if she applies for a visa and claims she is doing both of these things, her visa application will be refused.