I believe your looking for this fanfic, which so happens to be on fanfiction.net.
Beyond Distant Time by Caithyra
The choice is to change history, and never have Inuyasha's love. The choice is a world where she is just Kagome, not a second Kikyou. Will she save Inu no Taishou? And send ripples of change through time? It's a world she wished for, but fears as well.
It's Rated T, and also unfortunately has been DISCONTINUED/ON INDEFINITE HIATUS.
here's the link:
www.fanfiction.net/s/5562158/1/Beyond-Distant-Time
It's a very good read, Enjoy!
EDIT BY WICCAN: This story would be rated M on our site, NO YIMs!