What to do about my friend? Do I give up or keep trying?

[bex2a]

I've been trying really hard to get in touch with an old friend who I've known for 20 years but nothing is working.
Christmas before last, she sent me a card to say sorry not being in touch but had moved rather suddenly to another part of the country.. She wrote new address in the card but, foolishly, I didn't write it in my address book or in my diary or anything.
During the Christmas period I had a flood at home and lost a lot of belongings, ended with all the card ruined so had to throw them away.
When her birthday was coming up a couple of months later I messaged her on whatsapp, explained about about the flood and asked if she could tell me her address as I wanted to send a birthday card. No reply.
Then no birthday card for me when my birthday came the following month.
Nothing last Christmas, and nothing this birthday.
This is the first year in all the 20 years we've known each other that she's never sent cards. Even if we don't see each other in person for a few years at a time, she always remembered birthdays and Christmas cards.
All whatsapp and SMS are going unread.
No mutual friends in common, although I did find her mum on Facebook. Message to ask if friend was ok but the message has never been opened by her mum.
Phone number I have for friend no longer connects.
I've even been checking media and googling her name just in case she's passed away. Nothing.
No longer on any social media and was unemployed so no point even looking on Linked in or trying to contact via an employer.
What else can I do? Or do I just leave it?

Does she have family members on FB that you can trace through your FB connection with her? Have you tried other SM platforms like LinkedIn?

ETA scrub the suggestion about LinkedIn

It's very strange that now only she has disappeared but everyone else connected to her have also stopped responding to your communications. What about trying to contact her last known address to see if the occupants can tell you her forwarding address? Sorry, not sure what else you can do

Do you remember which town she moved to? You could post on a local facebook page perhaps?

This is a good idea

If she moved suddenly to another part of the country, she could of been in hiding from someone. In which case she will have changed her phone number, given that whattsapp is linked to phone number, she won't have access to it anymore. FB is your best bet, but if she is in hiding, could be tricky.

Normally I would say just leave it, but in this case I would want to make sure she was okay and actively choosing not to be in contact with me before dropping it.

Do you have people in common who would be able to tell you more?

Is the electoral register a possibility? The Police Missing Persons or Missing People?

Hope you find her safe & sound. It's definitely a strange one.

Some people have it set up where Facebook messages from people who aren't your friends go to a different folder - I discovered when a friend of a friend said she'd sent me a message about a hobby we have in common. I found this folder with no only her message but full of messages from people regarding items I had listed for sale over the years (thinking there had been zero interest!) and messages from random creepy men.

Could you add her mum as a friend and send the message again then you know she will definitely have seen it?