[metmom]

Do you have evidence? Keep in mind Mary is already special; she had a virgin birth.

Mary said God was her savior. Only sinners need a savior.

If she was sinless, then she didn't need a savior, so she would have been lying in calling God her savior, which just ended the sinless streak.

Sure. Mary had a virgin birth. OK. There's Scripture to back that up, and plenty of it.

How is that connected to her supposedly being immaculately conceived?

[ronnietherocket3]

Mary said God was her savior. Only sinners need a savior.

The belief is that she was saved from Original Sin at the moment of her conception by God. So God is already her Savior. Jesus died on the cross to save all mankind from their sins, but with respect to Mary, his sacrifice prevented her from being stained at her Conception (yes God can operate backwards in time). You want evidence for this, see Rev. 12. You want biblical proof, there does not appear to be any that meets the Sola Scriptura level. However, I am not a Sadducee, so I do not hold SS to be doctrine.