Very nice and very original, I must say. I would say go on with this, however, are you so sure you want her in Hufflepuff? I'm not trying to be cruel but I think that with the higher knowledge in Alchemy and the facts that she has visions would make her lean more towards Ravenclaw. The only two of the original characters in there are Luna Lovegood and Cho Chang and you can leave both out if you like.
Again, just a suggestion, not trying to mean or harsh. I really do like your character, she sounds very promising. I say onward with your tale.
I hope to see your story soon.