In reply to Removed User:
Only that you need to consider what else there is nearby... Most apples need at least one other pollinator in the same group, to ensure they flower at the same time. One option is the complicated grafts that include two or three compatible varieties on the same stem. Has she got neighbours, or nearby apples or crab apples?
Not sure about the location, but perhaps avoid one of the really early flowering types as the longer winters up there might prevent many insects paying a passing visit.