"Emma" and I met at college nearly 30 years ago. We were on the same course and quickly became inseparable.
Over the years, "Emma" has struggled on an off with her mental health but has never wanted to get proper medical advice/treatment/support. She had a tendency to go down rabbit holes with Dr Google and self-diagnosed with various conditions including: Clinical depression and schizophrenia. No medical input at all.
Due to her poor MH, Emma has often dropped off the social radar for long periods, but always kept in touch by Christmas cards and birthday cards. Could go years with physically seeing her (her choice, I never pestered for contact) but she would never forget occasions like birthdays.
3 years ago the cards all stopped. She moved about 2 hours' drive away from myself and other friends in our small circle of friends, changed phone number (none of us have new phone number of hers, but the old one is disconnected), no WhatsApp messages can be sent, she's disappeared of FB.
At weekend, I was using Instragram and in the messages bit (where I messaged her a few times over the last 3 years asking if she's ok, without answer), Instragram showed her as last being "active" on her account a few hours ealier.
So, she's using Instragram but has basically ghosted us.
What do we do?