Great stuff.
Interesting use of ellipsis, there.
Were there any other words between "by" and "Mary" in that sentence, or did St. Alphonsus just include a dramatic pause?
Here's a hint: that sentence does not exist in the book "The Glories of Mary." (Not in the standard English translation, nor in the original Italian.)
Your source, or more likely you, invented it.
Go read the entire sections.