This says... "If you receive your Confirmation of Permanent Residence on or after April 18, 2017 and it indicates that you “must cohabit in a conjugal relationship with your sponsor or partner for a continuous period of 2 years after the day on which you became a PR”, this requirement no longer applies to you."... On or after April 18, 2017. She got PR papers in September 2016, this law was still in effect. So what's the final answer?
Question has been repeatedly answered.
Sounds like you would be best off hiring an immigration lawyer to assist you.