All the other young female characters in this game look like "girls", but Julia looks like a proper "woman". I don't know if you'd agree with me, but I can spot a hint of maturity (and also maybe elegance?) in her face, body, and character, that is absent in other female NPCs. And that's what makes it particularly frustrating for me - she's unique, yet unavailable...
But I guess those same characteristics also make her a good fit for a guardian sister.
Look at her face, I don't think she gives off the college girl vibe that other girls do or the MILFy vibe that Rosa gives off. She's something else entirely - an actual "woman". (Forgive me for being vague here, I'm having a hard time finding the right words).
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