So our friend has vanished. Now what do we do? (long... and weird)

What about mental health issues?
Maybe she just cracked under the pressure of something (real/perceived) and is sorting things out or something?

Thanks for the responses. We are definitely going to send some letters and see what happens. I’ll update this if anything comes in. I appreciate all your help getting me different perspectives on this. Thanks again!

When my friend vanished and her friends called her house her mother would say she wasn’t home or on a vacation. She had a mental health breakdown and was in a hospital getting sorted out. To people who don’t know she has a condition she would have disapeared and to those who knew well it got around to all the friends that she was in the hospital and not missing. This happened every time she stopped her meds and was put in a hospital setting.

Witness Protection Program?