The VO would have outlined her reasons for refusal in the Refusal Letter. On ours, it says "Based on information available to me, I am satisfied that you are a person described in section 4(1) of the regulations. This is because of the following reasons:" ... and it goes on to list what she sees as red flags in your application, and was not adequately addressed in the subsequent interview. She probably did make her mind up before the interview, but the interview was your wife's opportunity to try and change the VO's mind.
Wouldn't be able to offer much advice without seeing your supporting material.
Try to look at your supporting material objectively and see if it strongly supports your position. Maybe have a third party look at it and give their brutally honest opinion. Many immigration lawyers and consultants can do a quick review of your case for a small fee. But it's better to have your BB in hand, as it provides more detail on what transpired during the interview. It was likely a very traumatic experience for your wife, so don't count on her memory.
Rush to get married probably set off a big red flag. If you are a recent immigrant to Canada, that is another red flag. Differences in age, ethnicity, religion, education, and so on. They all add up.