xiziggyix - don't feel stupid, it baffled me too.
There is a book on artifacts = believe it's sitting on a bench behind the woman ?
It tells a story on each artifact.
I believe these are what she will buy.
I say "believe" because I went there with a bunch and she only noted two in her dialogue options.
Just have the items in your inventory.
I would keep several artifacts = you will see why later
If you already know why, then sell away
I luckily kept a bunch to look at ... I had 2 she noted
So, what I saying is don't sell them all = keep extra in case she only recognizes a few ?
I don't know why she only had 2 in her dialogue options, when I had at least five from the book ... I'd hate for you to sell them all only to find you "NEED" two ... I don't want to give away the reason to keep two
Maybe a MW expert knows why she won't recognize all the artifacts in ones inventory.
If you want to know why "you need 2 artifacts", PM me = I'm not sure how to black out script and I don't want to ruin the story/quest for you
If you need $, I can give you an easy way to accumulate it ... one via alchemy(... need the level around 50) OR stealing(... glass armor and a vault) ... you probably know them, but in case you don't
I hope my convoluted response helped.