Well, you cant legally, but you can back off as little or as far as you feel is best for you. Once your child is an adult, your involvement is totally up to you. I always let my adult kids grow up and learn from their own mistakes. My choice, but a good one for them as they are all thriving, at least work wise. Only one is still a problem for himself. If he starts getting verbally abusive, i stop talking and give him three days in a row until i will engage him again. He is almost 40 and knows better. And knows the boundaries I have set.
So you decide what you want to do and what boundaries to draw with your daughter. Whatever you do though dont put expectations that your daughter will change. You cant control her. Do whatever you do or dont do for yourself, not her. Put yourself first.