RN = registered nurse
She can take kids and spouse with her on a student visa. The spouse can apply for an open work permit. Generally students can work on campus without a permit and after 6 months can apply for an off campus permit for up to 20 hours a week during the semester and full time on school holidays. After she graduates, she can apply for a post grad work permit, open work permit for up to 3 years. To apply for PR, she needs to qualify to apply under some immigration class. Probably the best for her would be to work for 1 year and apply under Canadian experience class.
thannks for info i will tell her