Hello,
Your wife still needs to get her Permanent resident approval to come to Canada. She cannot enter just with the Quebec selection certificate.
You must send her a photocopy for her to take with her to the embassy when she goes for her interview and to pick up her Visa. She also will need the photocopy with her when she lands in Canada. When she arrives at the Montreal airport she will go through the Canadian immigration office, as well as the Quebec landing office also. She must have the Quebec selection certificate at that time. She will need the original Certificate when she applies for her medical card, SI number ,etc...
Do not send her the original Certificate to her, you must keep it safe in Canada until she arrives. Only send her a photocopy which you can just Email to her.
Good luck with everything.
The 'original certificate', is that just that "cerificat de selction du quebec" thats signed? It's just that the one they sent me is very unoffical looking, just a normal printed page with my details that is signed and it actually says DUPLICATA on it in the top right under my reference number.