If a Polish female has Mańkowska in her Polish passport, may she retain it in her US/Canadian official documents?
I think, yes. When she marries Kowalski she is Kowalski and all her female children are Kowalski (unless they'd like to apply for name change which is easy as far as I know)
Intresting though is when Mankowska is not maried and has a male child. Her son would be Mankowska then.