Kangane got married to Anant (Hari's elder brother) so she can be close to Hari...Once married she does black magic to hari and somehow makes him married to her (I think hari marries her)...Something happens she is dead (we don't know if she committed sucide or the family kill her to save their respect in the society.....)
She wanted to marry hari so she resides in Bindiya's body (Bindiya was Shree's cousin) Finally shree was able to get rid of her and Kangana's truth surfaces in the family,..../
Kangana is back again this time she wants to kill Hari to complete her revenge.....