I found a rather useful doctoral dissertation concerning the commentary of Cornelius a Lapide and Mariology.
The dissertation is entitled Cornelius a Lapide’s biblical methodology used in Marian texts and its comparison with a contemporary approach. It was written by the Very Rev. James Presta. It contains a number of translations into English from the commentary that you won’t find anywhere else.
The thesis is available for free online download at this link. Scroll to the bottom and select “download.”