She's got a plan.

Arya flung the door open on its hinges and strode right up to the young man as he sat on the bed, again polishing the armor he held. He made no effort to move, only looking up with curious eyes.

"My father is the Lord of this castle," she stammered, "and you will do as I command."

"And that is?" He asked bluntly.

"You'll train me to be a knight and when the time is right you'll knight me yourself, if need be."

The young man began to laugh. "You can't be a knight! You're just a girl. Shouldn't you be marryin' some lord or somethin'?"

"That's not me," Arya began. "That's Sansa. She can be a lady or the Queen for all I care. I want to go on adventures and fight off robbers and thieves and see the Seven Kingdoms."

"Haha," he continued. "Very well. And what's in it for me, huh?"

She knew what she had to do. She might have hated Sansa and Jeyne Poole for calling her names, but she had learned from them where she could and she knew there were ways to get what you wanted.