Note the negative formulation. I'd suggest that the way to 'get' it is, "There is nothing WRONG with this, but that doesn't mean there's anything RIGHT with it, either." And often in recent years an explanation more or less to that effect is appended to the imprimatur.
Further, while it could be free from error in matters of doctrine and morals, that certainly doesn't mean it's free from error in matters of fact, or even of "vibe".
I guess debating whether or not someone who may or may not have existed was a nun makes me want to get out my knotted cord and count the angels on a nearby pin.
LOL!?! Then why on earth are you doing it? And to the exclusion of discussing what this woman actually did -- she saw the RCC up close and personal and she fled from it.
As God wills.
Their idols are silver and gold, the work of men's hands. They have mouths, but they speak not: eyes have they, but they see not: They have ears, but they hear not: noses have they, but they smell not: They have hands, but they handle not: feet have they, but they walk not: neither speak they through their throat. They that make them are like unto them; so is every one that trusteth in them." -- Psalm 115:3-8"But our God is in the heavens: he hath done whatsoever he hath pleased.