Your wife has a CoPR and one time visa. I don't think why it is a special case instead your case is strong as she has a valid reason to travel to Canada to unite with immediate family (which is you). If her CoPR is issued prior to 18th March then she is allowed to enter in Canada. Since other CoPR holders have already booked AI flight tickets then I believe based on that you can also book ticket.Hmm. May be less people at tat time. Now its not going through.
Thanks