You won't be able to bring her with you immediately to Canada. You will need to settle in Canada first and then wait a few months (and have a job that meets the income requirements) before you can apply for a super visa. She will have to pass a medical as part of the super visa. Whether the super visa will be approved will depend on the severity of her Alzheimer's. Note that a super visa does not allow your mother to move to Canada permanently - it only allows her to visit. She will still be expected/required to return to her home country and live here for significant periods of time after visiting Canada. Technically you could try to apply for a TRV immediately if you want to try to bring her as a visitor to Canada with you at the same time as you move. However we very strongly advise against this since TRVs have a very high rate of refusal in these situations and that will lower your mother's chances for a future temporary visa approval.
I suspect a PR application for her would be refused due to the Alzheimer's. However you can certainly try and see what happens. You won't qualify to try to sponsor her for PR for at least three years after arriving in Canada.