I love how you negate the fact that Shania has the #1 best selling album by any female artist of all-time.
That one album is still ahead of Taylor's entire discography. I know album sales aren't what they used to be, but albums being certified double DIAMOND in the late 90's, especially by a female, was just as much of an anomaly then as it is now. Not to mention that she's had not one, but TWO other albums certified diamond.
Also, "You're Still the One" is an all-time classic (not an ATRL-only classic like "Shake It Off"). Sorry, but that's all untouchable. She also has many other awards and accolades that you (of course) failed to mention in the OP just to validate your subjective opinion. Taylor is up there, but don't get cocky.