Elle's mother is Aileen (Smith) Abercrombie, of the pureblooded Smiths.
Honestly, I don't have listed any aunts/uncles - so feel free to have her related as you see fit. I don't really care! I just need to know in the end!
Oh, yeah, if you need some other relation, I always (in my brain) assumed that Elle's mother was a pureblood, so her grandmother can be of... any random pureblood name you'd like. If you need first names for grandparents, let me know.