Hi,
You have applied three times in a span of eight/nine months. Do not reapply for some months i.e. until your wife's circumstances change + you can prove that she has addressed the refusal reasons.
Refusals were pretty much guaranteed if you applied/reapplied with the exact same documents (except for the new deposit of CAD 14,000) without addressing the refusal reasons.
What are your wife's ties to her home country: Employment/business/study + land/property ownership/lease agreement + financial situation (do you transfer money to her account?) + previous travel history?
Cheers