Who exactly is she?

Muriel was a vampire like Lestat.

Alice wasn't quite sure, but she subconsciously suspected that the 'she' Muriel was talking about was the same person as the 'she' Lily was talking about.

And hearing Alice's words, Muriel turned back in surprise, "Looks like you know quite a lot."

It didn't feel good to not know anything, and Alice suddenly wondered if perhaps her meeting Muriel wasn't such a bad thing for her, and if it went well, she could get what she wanted to know from him.

She looked at Muriel with burning eyes and said, "Yes. I know Lily and Lestat from the Bruch family."

Muriel was slightly stunned and his face, which had been wearing a smile, suddenly went cold.

"Lestat." he read faintly, his eyes falling straight on Alice, a storm coalescing under his eyes, but after a moment all those complex emotions in his eyes were reduced to a mockery at the corner of his mouth.