Honestly? I think it depends on whatever model you are using, since the model's training is likely different. You are better off being consistent with your own personalized formatting system, so the model learns your patterns. That being said there are a couple of consistent things. Asterisks for emoting your character, and quotes for talking in first person with your character. Of course your PoV you use matters as well.
The example you gave, you used, I, so LLM probably thought what you said was in first person, and assumed you were still talking to Rosalyn, or whoever despite not using quotes. Consider using parenthesis, brackets, etc. and shift POV to third person for narrating. Avoid phrases like, "I think," and "Probably," and state it as fact.
ex: (Rosalyn is a murderous psycho.) "I have no idea what's wrong with her." *looks over their shoulder worriedly*
That way the meta knowledge is there, but your character doesn't know it yet, and you can use your character's emoting to support whatever narrative you are trying to direct things towards.
I know this topic was talked about a while ago, but I don't remember much and the post is long gone. So, anyone who has anything to share, feel free.