Judges make orders based on evidence not hearsay. This poster would have to be able to show that he is misreporting income.

Its very incorrect and bad advice to tell a poster to do nothing and let a judge take care of it. They can't...they don't have any conflicting evidence aside from what he's declared to CRA.

She needs to collect evidence and give it to her lawyer to compile. Once that's done and she has a case conference, she can then file a motion to have the evidence reviewed. Ultimately, when you are disputing reported income and asking for a variation, you need to compute an imputation amount based on what he's actually spending. And people have successfully done this...but it takes proving and you need documentation to do so.

If she leaves it to a judge, she'll get nothing more than what he's reported.

I highly recommend this OP to start finding every piece of financial documentation she can. Also document what he drives, where he lives, etc. And do some canlii research. The cases similar to yours will show you what you need to do to get his true income imputed to him.