She's 18, she's an adult. You don't have to give her a place to live, you don't have to give her money, you don't have to pay for college. Get yourselves to al-anon and start working your own recoveries. She will get better when she is ready to get better and not one second sooner.
Take what you want and leave the rest.
Edit:
BarelyHere, I liked the intervention. I am so glad it worked out for you and your daughter.