Here is the link with the forms to apply for your (LMO) Labour Market Opinion with Service Canada. You will likely need to advertise the position to Canadians for at least 2 weeks to show that no Canadian could fill the job first. ( check on-line for your provinces regulations on advertising, rates of pay, rates for room/board)) Here is the link:
http://www.hrsdc.gc.ca/eng/workplaceskills/foreign_workers/advertReq/wageadreq.shtml
Post the job ad on http://www.jobbank.gc.ca/ and on another place such as kijiji.ca
I think the immigration application goes to Vegreville, AB if she is here already? Not too sure, but here is the CIC link.... better call them to confirm where the immigration stuff goes and what you need to do...
http://www.cic.gc.ca/english/information/applications/visitor.asp
OR
look for a nanny agency in Canada and pay them to help you with all this, fees may be reduced if you found someone on your own.