Adeline had returned on her journey when it was night. Before she was able to leave she had no choice but to tell Reuven everything she knew about where she was headed. If not so, she had read Reuven's mind and she was able to tell that he was not ready to let her leave alive.
So, Adeline was smart enough to tell Reuven everything she knew about the witch and since she could tell that there was a way that the werewolves were able to tell if a person lied. Such was the case when she was captured and tortured among them, one of them had been confident enough to tell the others that she said the truth.
Reuven was still yet to understand why the female vampire was not drinking human blood like the rest of her kind. Even though he tried to read her mind, he had not found any information as to why she declined in drinking human blood. But that does not matter as much to him. What he believed was that Adeline was not a threat to their existence. And that was okay to him.
