For the ultra hard request - I hope this is it. Her family was sucked into the shikon and taken to the past in order to be uses as hostages and bait by onigumo who is obsessed with her. (This part happens in chapter 25.) I love this story and hope it is the one you are looking for.
www.fanfiction.net/s/554905/1/Kanashimi-no-Hate-ni-End-of-Sorrow
Kanashimi no Hate ni End of Sorrow By: Tamysan
It is two years after the defeat of Naraku and Kagome's heartbreak of seeing Inuyasha chose Kikyou. However, Kagome is summoned back when a new danger threatens. SessKag, Completed!
Rated: Fiction MA - English - Drama/Romance - Chapters: 31 - Words: 67,263 - Updated: Feb 4, 2002 - Published: Jan 19, 2002 - Status: Complete - id: 554905
EDIT BY WICCAN: Also on A Single Spark archive here: http://www.dokuga.com/spark/story/1822/1