Thank you so much for confirming this.You can claim those points once she finishes the landing process and is living in Canada.
No idea what a SID number is.
I believe that SID stands for Social/System Identification Number issued once the person becomes the PR process.
So according to your reply, once she completes the landing process (which takes approx 1 day) and obtains the proof of residence over there like bank account ( which may take 1-2 weeks) or the postpaid connection (might take 2-3 days) or a residence contract( might take 2-4 days), I would be immediately able to claim the 15 points for sibling.
Kindly let me know if I miss any important detail in this and also let me know about any other fast means of obtaining proof of residence over there which is recognized in the express entry process.