Hi Lost and Welcome to the Community.

Unfortunately, there is little you can do because she is legally an adult. Sometimes, as a parent, the hardest thing to do is to let them go. I know these words are not very comforting. As you feel more comfortable here, maybe you could elaborate on what led up to her leaving home and why it is causing you so much distress.

Hang in there - this site has quite a few parents who can relate/understand.