Mary needed a Saviour because, as a human, she was under the sentence of Original Sin. The application of the Redemption was made to her prospectively, from the moment of her conception. In this sense, Christ was her Saviour.
So many lazy minds, so little time!
Your post 145 ...
Mary needed a Saviour because, as a human, she was under the sentence of Original Sin. ... tells me that you are no expert in Roman Catholic dogma.
Try looking up "Immaculate Conception" in the dictionary.