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When you were knowing that she is pregnent you/She should have landed early, What Stoped her? were you waiting for Green Card in USA? Landing Documents CAN NOT be extended , your wife has to land before First week of November(expiry date on landing Papers) or lose her PR or Landing Papers, it can not be extended, do not try to waste your time by sending Fax to conulate and they are not going to reply you or extend the Landing documents. Only option is Land before expiry date or Lose it and apply it again. If you are NOT able/want to land better Return the Landing documents to the Canada Conulate which issued it before Expiry date and it should reach them before expiry date on the Landing Documents and inform them that your wife can not land , request them to return your ROLF, They will send your ROLF back in 2-3 months time that way you can get some money back.If you wish you can again apply no bad impact of not landing in future applications, you might be aware that Canada immigration in future is going to be tough and new immigration law is being passed(Bill-C-11) and new regulations are in process. Try to land if possible take the advice of a good doctor regarding what to do in emergency.
If you are in US just take the flight.
Good Luck!!!