TBH, I really don't believe that your sister had landed as a PR. The time line you provided didn't add up. Your sister got married in Jan. 2017, it probably would take couple weeks to prepare and submit the Sponsorship Application, and trust me it could be seen as fast. So, CIC may receive the application in Feb. 2017, the earliest. Then you said your due day was November, 2017, and your sister had come to Canada already. You probably didn't think that the average process time for application applied before March, 2017 from India (or overall) were longer (12 or more months) than those submitted after March, 2017 (10 months). If you check the NDVO thread on this forum, you would know that applicants from India that applied in early months of 2017, they would probably got their DM in March of 2018.
That's why I asked. Dates didn't make sense to me either so wanted to doublecheck.
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