concernedsister,
Just feel reassured that you and your parents did the right thing.
My oldest also has had others bail him out, but not me, I did that once and won't be part of it again.
Also, your sister is going to swing the blame on to anyone, and anybody that she can, it's called manipulation, and addicts have it fine tuned to perfection, so don't feel bad when she starts the blaming game. It's what addicts do.
One more thing, just because she was in jail, and your parents were looking into a halfway house for her, doesn't mean that would have worked out. Maybe, maybe not. When she's ready, she'll call and seriously ask for your help, and until then, you're kind of spinning your wheels.
Hugs to you, and your parents,
prayers for your sister, and all of you