Salvation asked met mom how she knew the mind of God... so you would agree with me that surely Salvation does not either..so her defense of Rc marilogy is nothing more than her personal opinion
We only know what has been revealed to us through Sacred Tradition and Sacred Scripture and in a very few instances private revelation. Salvation's defense of Mariology may not contained the phrasing I would have chosen, but it was perfectly valid.
Peace be with you.