In 1979 she had an experience while giving a eulogy at the funeral of a friend that forever changed her life. She later called it a "near-death-like" experience, being similar to many NDEs (including one she had earlier in life), but she was not near death at all. She describes it in one place this way...
Sophia von Klingnau was a nun who lived in a convent in Klingnau, Switzerland, sometime in the 13th or 14th century. Her writings were published in the Schwesterbücher (Sister Books).
This is how all people will know that you are of Me—if you Love each other.
We awaken in Christ’s body as Christ awakens our bodies, and my poor hand is Christ, He enters my foot, and is infinitely me.
And being admonished by these books to return into myself, I entered into my inward soul, guided by thee... And I entered, and with the eye of my soul—such as it was—saw above the same eye of my soul and above my mind the Immutable Light.