She'll hate prachi more after knowing she's her sister as she's already insecure thinking prachi is loved, respected and trusted by her family members so much, especially her father when prachi isn't related to them, so when she gets to know prachi is actually abhi's daughter then her insecurity will only become far stronger thinking that when her father trusts and loves prachi so much when he thinks she has no relation to him then that would increase far more after knowing she's his real daughter.
Yes, she is beyond redemption now. I don't have any goos expectations from her.