Rita's definitely judging him, and it shows in the disapproving look on her face.

When he asks her if she's been drunk, Rita starts to shake her head and say no, because really, what a stupid question. Of course she hasn't been drinking. But the word that ends up coming out of her mouth is different.

"Once."

Her eyes widen in surprise at her own response, and her face flushes. There's a pause, and then she hastily clarifies the answer. "I-I wasn't doing it for fun, it's because Lambert put all that alcohol into the poison cure!" So it's his fault, really.