Before, she had unexpectedly indulged in unprecedented speculation because of one hypothesis from Gaven, and her heart didn't entirely resist it. In the past, this would have been impossible.
This sort of thing, exceeding her understanding, was naturally categorized by her as magic. After parting with Gaven, her gradually stabilizing emotions made her even more convinced of this point; however, emotions themselves are the most magical form of magic.
Identity, appearance, demeanor, and even his deeds were all important parts of who he was, but the Crown Princess, owing to her unique upbringing and environment, had a different definition of an ideal partner that was intertwined with the interests of the Komeer Kingdom rather than purely personal love. She probably had a strong reaction to Gaven for this reason—if it was purely magic, they would have experienced it upon first meeting, and not through the exchange of information and deepened interactions.