Yes, though not without a struggle.

Arya suddenly begins to pout, saying, "Mother, I am a teenage girl. I am far too old to be wearing nappies."

"So are Sansa and Brynden," Catelyn rebuts, "Yet look at them."

Indeed, you and Lady Stark's older daughter are shamelessly sporting your own diapers. Despite that, her younger daughter seems adamantly opposed.

"Mother, I love you, and I have missed you terribly these last couple years," Arya insists, "But I will NOT wear a nappy."

Catelyn just sighs. "Very well. Brynden, could you come here a moment?"

You promptly waddled over to Catelyn, saying "My lady?"

Catelyn leans over and whispers into your ear, "Please 'escort' Arya over to the bed. Use whatever force you deem necessary."

"Very well," you acknowledge. You then casually saunter over to Arya, who seems convinced that she has won the argument. But just as she lowers her guard, you seize her from behind. She puts up a valiant struggle, but as you are bigger, older, and stronger than her, her resistance is futile.

Soon you have taken her across the bedroom, and you force her to lay on the bed. Lady Stark swoops in at once, hastily undressing Arya down to nothing. Within moments, she has her diapered just as thickly as you and her sister.

"Perfect," Catelyn says in approval. "Now that all three of my babies are in the nappies, it is time for..."