It’s not about not raising your voice - the point is to show how proud she is. Why should she break down and explain herself to Asher when he never had that faith in her in the first place? If she explains herself, sure, he’ll apologize and everything might be great… but she’ll always know he didn’t trust her. And will it happen again? ------ That’s kind of what the silence is playing on. Her pride and her trust/relationship with Asher.