I am not Catholic so I don't automatically take such church-approved private revelation claims at face value.
In my own personal opinion which you can disagree with, most of the people claiming to have these types of supernatural encounters are attention-seeking imposters which is a form of pride.
Where to draw the line? I've heard of enough Virgin Mary in the grilled cheese nonsense over the years that I mostly just dismiss all of it now.
How Many Miracles are Required to Canonize a Saint?
Saints [Catholic, Orthodox, Open]
SAINTHOOD 101: Rules for Becoming a Saint [Catholic Caucus]
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Pope Lists Criteria for Causes of Canonization
To the best of my knowledge, the Church has neither approved or disapproved these private revelations ... in any event, no Catholic is obligated to believe them.
St. Catherine is generally considered to be a mystic. I suppose their are some who say that there is no such thing as a mystic, that it is impossible.
It’s fair to say that believing that would be contrary to the Gospel.
“From the beginning of From the beginning of 1380, Catherine could neither eat nor swallow water. On February 26 she lost the use of her legs.[21] St Catherine died in Rome, on 29 April 1380, at the age of thirty-three, having suffered a stroke eight days earlier”