In the very beginning of this nightmare, Cindy, you publicly "forgave" Casey. Now it's time to "forgive" yourself for any imagined or real shortcomings you feel contributed to Casey's persona. It looks to me as though you did everything conceivable for your daughter, even to the point of nearly losing your husband because of her behavior. It's a familiar scenario to me, because I've done the same thing in my family. I think many, many mothers do it, even if a lot of them don't admit it. Our kids are us, we think, we feel....we are wrong. They reach a point in life when they have to own their deeds, their actions, their successes and their failures.
You never abandoned Casey....you never lost her...you were her champion, her rescuer, her scapegoat. You need to rescue Cindy, now. You have to admit to yourself that while you will always love Casey, you don't, like her. She is not you nor a reflection of you. She is a young woman who made choices for herself without any input from you...you cannot go back in time and change the way you handled Casey's early behaviors that caused you concern. Hindsight is perfect sight...if only we knew then what we see so clearly now....a lot of us have been there.
It's time for Casey to set you free and if she does not, you must escape. Give her one more chance to tell you the truth. You already know what it is, you know you do. If she lies again, if she refuses you...walk away from her, save what is left of your family. Save yourself because you're a person worth saving.
God bless you...I will pray for you.