I love redemption arcs for victims of abuse. I think they serve as a wonderful message. A beacon of hope. But not every abuse victim has to be redeemed. Especially in a show that has other victims of abuse who break the cycle, it's fine to have a character who doesn't. It's sad but it also serves as a message to kids.
This is one of the few movies where I am fully siding with the parents. Jaime is, at times, cruel. Honestly, I don't think the boundaries her mother has in place are unreasonable. Jaime is a teenager living in a town filled with weirdos. Case in point: the very fact that someone murdered her mother over such a stupid reason (a reason I won't disclose as I think you deserve to find out on your own).