why is his inability to locate Lee relevant?
When you win a lawsuit, you get a piece of paper authorizing you to collect money from the defendant called a "judgment", but you can only collect money from someone if you can find income or assets that belong to them.
Do the courts in Canada not help find the people who have been ordered
to pay damages?
They do not. Indeed, there are almost no countries where they would.
What are Abramovitz's options in this case?
Wait for a few years until she has more assets and/or income from which he could collect.
Hire a skip trace firm to locate her.
Require her to provide sworn testimony regarding the location of her assets and her sources of income, if he has been unable to determine this on his own.
Locate real property that she owns (either with public records or investigation or from her sworn compelled statement) and then put a lien on a real property she owns and then foreclose on that lien. The buyer at a foreclosure sale would have to assume any higher priority debts in the property (like a first mortgage) and some of the equity might have to be returned to her as a "homestead exemption".
Garnish her wages and bank accounts and investment accounts. Garnishments of wages are only for a portion of wages, not all of them.
Attach and have sold her tangible personal property of significant value (including a motor vehicle) that is not exempt from creditors.
Of course, it would cost money to attempt any of these steps that may or may not be recovered.