I'm new here,so maybe i dont know the whole story but i read your other post( update...) . You want to let go but cant,out of guilt and because you care about her. But you have nothing to feel guilty about,its the choices she made.
Does supporting her more and doing more for her guarantees she become a better person? 'm telling you this because i'ts what i keep telling myself.hope it helps. and i hope things get better for you.