There are legends that grow up around some saints, like any important historical figure.
In the US school children used to be taught that George Washington chopped down a cherry tree when he was a kid, and when asked about it he chose to tell the truth instead of lie. That was a legend that grew to teach children a lesson.
There were tales that she rubbed pepper into he skin to cause it to be irritated and one that she rubbed lime on her hands - not on her face - and that caused burns that lasted for a month. Not a permanent maiming, just a form of mortification. She undertook many forms of mortification, we are always advised to ONLY do such things under spiritual direction.
Some of the more recent investigations about this saint say that she suffered from mental illness.
We are to look at the Saints as examples of virtue in spite of their failings, not because of them.