I think this is the part they are referring to
Jasnah took a deep breath. She seemed reluctant to explain. “I have taken the initial steps in arranging for you to be betrothed to one of my cousins, son of my uncle Dalinar Kholin. The boy’s name is Adolin. He is handsome and well-acquainted with amiable discourse.”
“Betrothed?” Shallan said. “You’ve promised him my hand?”
"I have started the process,” Jasnah said, speaking with uncharacteristic anxiety. “Though at times he lacks foresight, Adolin has a good heart— as good as that of his father, who may be the best man I have ever known. He is considered Alethkar’s most eligible son, and my mother has long wanted him wed.”
“Betrothed,” Shallan repeated. “Yes. Is that distressing?”
And
“It doesn’t bother you at all?” Jasnah said. “The idea of being beholden to another, particularly a man?”“
"It’s not like I’m being sold into slavery,” Shallan said with a laugh. “No. I suppose not.” Jasnah shook herself, her poise returning.