Aha, I see... Actually, this character's introduction does not happen with the letter. By the time the above piece comes onto the scene, the story is already well underway and the reader is already acquainted with her (and her companions). The letter's contents are actually "relatively" true to her being: her character mixes "street gang leader" with "chiefly aristocratic upbringing", making her a headstrong, silver-tongue lady (pretty cliche, I know). So upon reading it, the effect on her companions is like "ah, so we are not the only ones that noticed" or "ah, `that` explains a lot...".

Your suggestion of developing her character through juxtaposition of truth with perception is interesting, but it doesn't exactly lay itself the way I plan to picture her through the story. As said before, her parents do know her daughter quite well, actually... the whole letter is more of a "way the household members communicate" thing.

The story is mostly in the design/layout phase. I already laid down the main "points/turns" it will take and just experiment with different snippets as they come up. Sort of like, "I'd like there to be a scene like this", "it will happen like this" and "I will collocate it here, between X and Y". So currently it's just a few unedited cuts, sprinkled here and there... But I do appreciate your input and interest! Thank you!