I think initially its fair to think the seller should have described it but, as has been mentioned, it may simply not have been something they noticed. Likewise, were the images detailed enough for you to be able to tell? You do need to be eagle eyed on ebay sometimes as well as accept that images are there to ensure you can see and make a decision on what you are getting.
I am never a fan of partial refunds. If the item was decribed as having original accessories, I would simply ask to return the item as not as described. This way you have your money ready to shop all over again for her when she pops back up.