The main plot of the story is that Kagome gets sent back through the well too far back, where she, Sesshomaru and Midoriko have to work together with Kagome in the middle of the other two, trying to make Midoriko not kill Sesshomaru. I remember that he wears his hair in a plait, so ad to not constantly be confused with his father, and that Kagome's hair gets cut near the end. I thought the title had the word 'Taiyoukai' in it, but I'm not entirely sure. Please help!

I believe it's The once and future taiyoufai.

The Once and Future Taiyoukai » reviews
The well was supposed to be stable. It was supposed to send her to Inuyasha. And it failed. Now, Kagome's even farther into the past and she must depend on a young Sesshoumaru, who has no idea of what their shared future holds. But neither does Kagome.

Oh my gosh, thank you so much!

You're welcome , just happy I finally knew one of the answers to these hehe.