According to Roman Catholic doctrine, why does Mary refer to God as her Savior if she was born without sin?

In the Magnificat, Mary refers to God as *her* Savior. According to Roman Catholic doctrine, Mary was born sinless and remained sinless throughout her life. So, why does Mary refer to God as **her Savior** if she was sinless (and therefore would not have need of a Savior or even have one). > And Mary said: > > “My soul exalts the Lord, And my spirit has rejoiced in **God my > Savior**. For He has had regard for the humble state of His > bondslave; for behold, from this time on all generations will count me > blessed. For the Mighty One has done great things for me; and holy > is His name. And His mercy is upon generation after generation Toward > those who fear Him. He has done mighty deeds with His arm; He has > scattered those who were proud in the thoughts of their heart. He > has brought down rulers from their thrones, And has exalted those who > were humble. He has filled the hungry with good things; And sent away > the rich empty-handed. He has given help to Israel His servant, In > remembrance of His mercy, As He spoke to our fathers, To Abraham and > his descendants forever.” (Luke 1:46-55)