Rick:
My advise is to contact your Canadian Embassy about the possibility of taking your "step-daughter" back to that country and ask what the requirements are for entry and eventual Canadian Citizenship for Wife and Step-child.
You would probably need Dominican passports for both your wife and your step-daughter with the equivilent of a "Green Card" Visa for both if you intend to apply for Citizenship for both, once back in Canada.
That's the way the US law reads, not sure about Canadian Law, but would certainly check it out with the Embassy first.
Saves a lot of head/heart-ache later on if you do it that way.
Texas Bill