Here's a fascinating article (Link) about the ecstatic quality of her melodies.
The scale-method of writing Gregorian chant had just been invented and was still in the formative stages.
In researching the origin of Gregorian chant, I learned something that I have repeatedly heard in the Maronite Church.
The Gregorian chant is the oldest musical manifestation of the Occident and it has its roots in the songs of the old synagogues, since Jesus Christ`s times.source ref.
Both draw their inspiration from the early christian church.