You can read about the 5 year ban here: http://www.cic.gc.ca/english/immigrate/sponsor/spouse-apply-who.asp
Five-year Sponsorship Bar for persons who were sponsored to come to Canada as a spouse or partner
On March 2, 2012, changes to the eligibility requirements for sponsors came into force. These changes bar a previously-sponsored spouse or partner, from sponsoring a new spouse or partner within five years of becoming a permanent resident, even if the sponsor acquired citizenship during that period. Other members of the family class will not be affected by the regulatory changes.
So.. that means your partner can sponsor you but only when it is 5 years after she landed as a PR. If she landed in 2007, that should be this year. If she landed before April 20th in 2007, she could even sponsor you right now. If she landed in December 2007, she can not apply for you until December.
Five-year Sponsorship Bar for persons who were sponsored to come to Canada as a spouse or partner
On March 2, 2012, changes to the eligibility requirements for sponsors came into force. These changes bar a previously-sponsored spouse or partner, from sponsoring a new spouse or partner within five years of becoming a permanent resident, even if the sponsor acquired citizenship during that period. Other members of the family class will not be affected by the regulatory changes.
So.. that means your partner can sponsor you but only when it is 5 years after she landed as a PR. If she landed in 2007, that should be this year. If she landed before April 20th in 2007, she could even sponsor you right now. If she landed in December 2007, she can not apply for you until December.