It would depend on the facts. It may work.
It's not about unsafe. It's about the actual fact and you proving them.
In your case it may depend on why you need her and not someone else, how old the kids are, did something happen to you that you need her, for example, did you just separate etc etc.
If you can afford an immigration lawyer this may be a good reason to retain one.
What you can do to find a lawyer is one of the following things.
You can contact the Law Society and use their Lawyer Referral Service. You will be given the name of a lawyer and can consult with the lawyer and the first half hour will be free.
Or you can check on a site called lexpert
. This is a legal directory of leading lawyers and law firms throughout Canada and is well-respected by the legal community.
Here's the link to their website: http://www.lexpert.ca/Directory/DirectoryContent/FindLawyersOrFirm.aspx
I hope that helps as a starting point.
Please click accept so that I can receive credit for providing you with this information.