In such a case, the word “saved” would be totally inappropriate. “Spared” would be the appropriate word. If she was “spared” from original sin and then lived a sinless life, then she was not ever in need of a Savior. But she herself testified to the contrary in theopneustos Scripture.To the contrary. Rom. 3:23 doesn’t state “…all HAVE sinned.” But rather, according to the Greek, "…ALL SINNED (aorist, not perfect tense, i.e., in Adam) and (continually, present tense) fall short of the glory of God."It’s a non-issue here. ALL men were “made sinners” by ONE act of ONE man (Rom. 5:19). You may not like it, but that’s Divine revelation. You may not even believe it, nonetheless, that’s Divine Revelation.He knew That “…ALL sinned (in Adam) and (continually)* fall short of the glory of God*.” His statement would include Mary. NOWHERE in Scripture does Paul or any other writer teach otherwise.
True Christian doctrine is built on Divine Revelation (what God has revealed), never on man’s speculations. It’s what separates true Christianity from all the religions on earth. IOW, it’s not man-made, it’s Divinely revealed. That’s why true Christianity is faith based.