I will admit the caveat that "Halfling with lycanthropy" is what we know from the mines and the bits and pieces of scraped info - which functionally is no more than "Half-elf with vampirism" or "human with warlock pact".
Do I really believe that if Larian had gone ahead with Helia, that she would have remained as 'normal' as "good-hearted Halfling struggling with lycanthropy curse that gives her evil, violent compulsions" (As werewolf lycanthrophy is meant to do by realms lore)? No... I most definitely don't trust that Larian would have been satisfied with that. It would have almost certainly ended up being added to and stacked onto until it was something equally ridiculous and over-the-top to match the other incredibly special origin characters, by the time it reached us.
Come to think of it though... maybe that's another reason she got cut out? Maybe having a strange curse that created violent, bloody... some might even say, dark, urges was deemed too similar to their dark urge plans, and rather than rethink the character, they just scrapped her because that was easier?