I would argue in favor of the first daughter possible redemption. She's a teenager who have been terribly educated. But if she saw other things, worlds outside her family and social class, she may be able to change.
Its probably gonna get much worse before it gets better for Leslie, hopefully whatever he does accelerates her leaving the Speardo family for good. As for Eli
She is a spoiled little shit but even she realizes her father is going to far and reveals his plan so that Leslie can be saved(and out of her hair) but saved nonetheless.
This little girl wants to destroy her family, she wants them to pay for what they've been doing for centuries now. She does not want peace, she just wants to slide along unnoticed until she can do the aforementioned destruction.
So even Leslie's sister has a change of heart? That's surprising.
Also I feel like it wasn't her sis fault for hating her, it was MOST likely that their parents pampered her to not love Leslie.