Hola! Creo qué tal vez sea este el fin que estés buscando, saludos!

www.dokuga.com/spark/story/6896/1 —> Deception by JosieKnox (El rating probablemente sería MA pero no estoy segura)

Tsubaki lies to Sesshomaru saying that kagome cheated on him an kagome finds them in bed together she leaves an she come's back with there son shippo who as a twin sister who is ill but she dies also Sesshomaru as a daughther with Tsubaki name kanna, Tsubaki shot kanna thinking its shippo,also all there friends dont want any think to do with kagome they turn there backs on her because of the lies plus his family do the same , Kikyou is her sister i think

Thank you it was the one i was looking for