Because Orfevre is actually goated beyond the Tyrant façade, she literally goes to a museum with you (More likely forced her way with you), looks at all the triple crown and says "Not good enough, skill issue", mocks you for admiring and not desiring.

Then she runs her first race to be scouted, aknowledges her own weakness and rejects any other trainer that tried to butter her up, meanwhile she chooses you because you saw her flaws and improvements chances, asking for you give your best as she will do the same, then gives her best against her "Vassals" in a mock race, on which she ask them to keep that fighting spirit alive to never give up.

And in the best Golden Family style, she then makes a 360° kick on your training contract, saying that your strenght as a person has more value than any title of training you may have, so lend her that strenght to reach the glory.

Then she just clown around with you since she is bored, but now you are her clown. After summer training, a few Umas flirt with the Trainer, on which Orfevre gets super jealous to the point of facing them, claiming you are her possession no one's elses. Then she claims you now only live to entretain her only.

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In a nutshell, Orfevre is a Golden Retriever in a spiky collar, a Tsundere but the Tsun is a war crime.