Hi iagirlsmom and welcome to the parents board... .we are so glad you found us, but oh, so sorry for what has brought you here. I can understand how frightened you must be for your daughter, it is just too much for any parent to have to deal with. What you are going through is so very scary and unfathomable to most parents... .but you have come to the right place for empathy and understanding.
So much of what you describe is so familiar to me, as we have been through it with our own dd21. She almost missed graduating from college, too, as she was totally wrapped up with a strange guy that she had just met on the internet and nothing else mattered - not school, not money (she blew through thousands), not her health or reputation, and certainly not her family. It was shocking and heartbreaking... It culminated in her ending up in the hospital in restraints; it was horrible. Our beautiful, sensitive daughter, out of control and in restraints... . So please believe me when I say that I get it... .the other parents on this board get it. We have all walked a similar dark and lonely path and we understand. Please know that you can say anything that is on your mind here and we will listen, without judgement...
You mentioned that you are looking for some new ways of communicating with your daughter... .An excellent place to start is at the top right hand side of this page

under the title Family Connections ... .Under the heading "Tools" are links that I found (and find) invaluable in learning to better communicate with my daughter.
You are not alone in this, iagirlsmom. I can assure you there are many, many wonderful parents who use this site, people who will be here for you, sharing their stories, listening to yours and supporting each other as best we can. Welcome iagirlsmon - I hope we will hear more from you when you are feeling up to it.
MM