Actually, Amber probably has a better chance of getting the help she needs in jail than out of jail. If she needs addictions counseling, they will provide that, transport her to and from counseling, and often times release from prison is contingent upon successful completion of addictions therapy. The same goes for her mental health and anger issues.
I think the HUGE difference between Amber and Butch is that Amber is still young. She still has room to develop and grow. As of now, I think both Leah and Amber have a right to see each other. I think those visits should of course be supervised, but in the end, Amber has never been verbally or physically abusive directly towards Leah. Of course it's true that by abusing Gary in front of Leah, Amber is harming her, but Amber loves Leah and Leah loves Amber. Leah is not in danger when she is with Amber and if Gary is not present (the visits are/could be supervised by a third party) then Leah doesn't witness the abuse towards Gary.