The analysis of a clause.

The sorceress Jasra and her son Rinalod are the protagonist's past enemies and present allies.
Jasra is now saying about her gone follower Melman, who was an occultist searching after a real power, to the protagonist.
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"It was too appropriate an opportunity to pass up," she told me then, "when you broke up with Julia and she grew interested in the occult. I saw that I would have to get her together with Victor, to have him train her, to teach her a few simple effects, to capitalize on her unhappiness at your parting, to turn it into a full-brown hatred so intense that she would be willing to cut your throat when the time came for the sacrifice."
["Knight of Shadows" of The Great Book of Amber by Roger Zelazny]
I'd like to know if the underlined adjectival clause modifies "hatred."
Thank you in advance for your help.