I didn't say that Lоna would be able to speak with monsters. lol
I understand that this contradicts the logic of the game. Not to mention the fact that the Lona spawn is locked to the sewer. Now, if it were an Orkoid cave, it would be a different matter.
I said that "NPC girls" born into monster tribes can understand the language of monsters, but not the language of people. They may show aggression towards Lona or raise the alarm when trying to save them. And also have large genetic mutations: red eyes, greenish skin.