Yeah, but if Charlotte knew, she would have say no when Lucy hired the MC. And you're right, Lucy is probably aware of the news at the time. But it's a bit different. Lucy is always in this world but in the meantime, she's not. She's working in the high Hillside world, she's not part of it. As a manager, she's always doing things, meeting people, etc. But as we can see during the event where she got punched by the actor, she's not totally swimming in the same waters. So even if she heard about the death of a young aspiring model/actress/whatever, she probably didn't spend much time on it. "Ok that's sad but I have things to do". Plus, I guess the cops (Carter maybe) kept the MC of the file. It's not really spoken loud, but Lucy checked MC's file before calling him and it seems she hasn't seen anything about the actor or else. So, it wouldn't surprise me much if she didn't have any memories of him. On the other hand, Charlotte being part of this world and having been in touch with the actor at a time, it's totally possible she has seen the MC... from afar. It would explain the déjà vu feeling. She haven't met him (obviously, since the MC didn't seem to know her at the beginning of the game), but she may have seen him and doesn't know where and when.
I guess. It would be a plausible explaination.