Hopeless, I am so sorry. I can share my own experience. My son has been in the throes of addiction for the past nearly five years. Like, you I've done everything I can for him. It's up to him now.
Your daughter is an adult. It's time for her to live life on her own. I don't know your history, but if she is using drugs and the behavior and lifestyle that usually comes with it, you can't be a part of that, and have any kind of life yourself.
I know this is the hardest thing you have ever done, just living through this. Not to mention trying to make good decisions.
It's time to start thinking about you. Again: Your daughter is an adult. Her choices are her responsibility.
It is time for you to set strong boundaries about what you want and what you will and will not do.
Write down what you would like to have happen in your house, and in your life. Set it aside for a while. Look at it again, and let that be your plan for what is next.
Keep posting here. Please give us more of the back story so we can be more helpful. Hugs and prayers and blessings for you today. Hang in there. There is hope ahead.