I would love to see data showing this. Do you have it handy?
Go
here; knock yourself out. You'll need to crunch data if you want to look at relative measures.
Labour force participation in Canada was atypically low in the mid '90s (sub-65%), peaked around 2005 and remained at/above 67% until past the "2008" threshold some studies cite, and has trended down a little since then. (Always look before and after the period the "social scientists" fixate on; ditto space as well as time.)
The obvious question is "why?"
Female labour force participation rates were lower in QC and Atlantic Canada. Why? What circumstances there depressed employment more than in other regions?
Trends observed everywhere require more sophisticated explanations than "cheap QC daycare".