The Seven Reincarnation

I Have a Relative, a Cousin of My Grandmother, who is a Spirit Questor. She is An Old Maid and what She Frequently does is to Talk with The Spirit of a recently Dead Person. If I Had a Chance to talk with Her, She Tells Me Stories about the Seven Reincarnation. In Her Stories, The Seventh or the Last Life of a Person, He/She Will Die Young so that He/She will not Commit Sin. She tells Me if a Person is a Man or Woman or An Animal in His/Her Previous Life. She Tells Me that She Will Be a Cat in Her Next Life But She Did Not Mention How Many Times She Lives. She Usually Tells Me Stories About Reincarnation. but Until Now I'm Still Puzzeled About This.