Upvote:4
There seems to be nothing you can do other than make a good application and see how it goes. We can't really provide any quantitative estimates of "chances of getting a visa".
It is good that you document your economy in addition to hers. Large unexplained transfers into applicants' accounts tend to make ECOs curious, but that should be easily dealt with by being upfront about it and explaining it in the application.
Keep in mind that finances are not in themselves at criterion for visas ("you must be this rich to go on the UK ride"), but are used in the visa process as a proxy for how attractive it would be for the applicant to abscond and stay illegally in the UK. If the application has evidence that speaks more directly to that risk, finances will be comparatively less important. So once you've explained whatever possible strangenesses there are in the bank statements concentrate your effort on showing how established a life she has in Canada.
Having permanent residence in Canada is a huge plus to begin with, compared to applying from a less affluent country.
If she has a stable job, that will be good.
If you have a stable job and the two of you have a joint household, that's also good.
If you're not living together in Canada (it sounds like she shares a house with her mother?) look for other ways to document the stability of your relationship, Put yourself in the mind of a skeptical ECO ("what if the guy is just paid by the girl's family to pretend to sponsor her, so she can get into the promised land?") and try to think of documentable facts that would be inconsistent with such hypotheses.