Punish Isabella

Becoming a knight was hard, it required either the acknowledgement of other knights, or for one to go through knight school and gain the acknowledgement of the knights there. Another way was to simply become a vassal of some nobles a task that was easy unless one gained many enemies within the noble court or if they simply doubted the vassal-to-be's skill.

You looked at her expectantly knowing what would come next

"Finally want a duel, peasant knight" Isabella said smiling haughtily

"Sure" you simply replied,

Isabella frowned likely shocked that you would ever accept her request

"However one more thing, if I win I get to do anything I desire to you"

"Fine" Isabella looked at you as if she was sure of her win however she added " But if I win you'll acknowledge me as a knight no matter what you think"