Our expert says:
It's one of the oldest lies in the book, that "I can stop anytime I want to --- I just don't yet want to" line. Anyone who steals from her own family to pay for her drug habit, DOES have a problem, and if she doesnt recognize and admit that, no rehab will ever help her, and she badly needs to grow up and take responsibility for her own actions. She is old enough to be working, and to pay for what she wants, not to steal. Maybe you need to make it very clear to her that if she ever steals anything else from you, you will call the police and have her arrested for theft, and that no sad stories will make you change your mind.
You havent described the situation quite clearly --- if it is your house she is living in, then tell her to leave it, and she can stay with your parents till she gets somewhere of her own. And tell her frankly that having discovered that she is an unrepentant thief and liar, you cannot trust her again, and can't allow her in your home.
If you and she are sharing your parent's home, you urgently need to get a place of your own, and establish the same rules there. You're all adults now, so why should it be up to your mom to decide what to do about the lying little thief ?
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