(((Tammy)))
I sure wish I had some helpful suggestions. You can love her without giving in and making it easy for her to continue this path. Some ideas are taking her id card, it might be a string you can control. Also, as a mom I'd call Mr. Wonderful's boss and ask for assistance. You and your dd need the real information on what is going on right now. It sounds like your dd is living for the moment in denial.
Also, the Chaplin's office would be an idea for you. They have so many resources, will have seen this before and know which options and channels are available.
Hugs to you. Eighteen is still so close to not being an adult and one day this time will be behind you all. Many prayers for your family.:grouphug: